Crash of a Boeing 377-10-26 Stratocruiser in Manila: 1 killed

Date & Time: Jun 2, 1958 at 0523 LT
Type of aircraft:
Operator:
Registration:
N1023V
Survivors:
Yes
Schedule:
San Francisco – Manila – Singapore
MSN:
15923
YOM:
1948
Country:
Region:
Crew on board:
8
Crew fatalities:
Pax on board:
49
Pax fatalities:
Other fatalities:
Total fatalities:
1
Captain / Total flying hours:
12495
Captain / Total hours on type:
5466.00
Circumstances:
The aircraft was on a scheduled flight from San Francisco, California to Singapore with numerous intermediate stops including Manila, The Philippines. It carried a crew of 8 and 49 passengers including one infant. At 21 23 hours (1 June) GMT the aircraft landed on Runway 06 at Manila. During the landing roll, the main landing gears of the aircraft collapsed. The aircraft skidded and swerved to the right until it finally settled on the right shoulder of the runway approximately 2 850 ft from the west end and 27 ft from the edge of the runway. One of the blades of No. 3 propeller flew off and penetrated the cabin area causing the death of one passenger and seriously injuring another. The aircraft was seriously damaged.
Probable cause:
The hard landing of the aircraft caused the failure or collapse of the right main gear 'V' strut support. Contributing factors were the heavy rains and gusty wind.
Final Report:

Crash of a Boeing 377-10-19 Stratocruiser into the Pacific Ocean: 44 killed

Date & Time: Nov 8, 1957 at 0127 LT
Type of aircraft:
Operator:
Registration:
N90944
Flight Phase:
Survivors:
No
Schedule:
San Francisco – Honolulu
MSN:
15960
YOM:
30
Flight number:
PA007
Country:
Region:
Crew on board:
8
Crew fatalities:
Pax on board:
36
Pax fatalities:
Other fatalities:
Total fatalities:
44
Captain / Total flying hours:
11314
Captain / Total hours on type:
674.00
Copilot / Total flying hours:
7355
Copilot / Total hours on type:
4018
Aircraft flight hours:
23690
Circumstances:
Clipper 944, 1 a regularly scheduled around-the-world flight, originated at San Francisco with its first stop scheduled at Honolulu. It departed San Francisco at 1951 2 on November 8 estimating arrival at Honolulu at 0550, November 9. There were 36 passengers and a crew consisting of Captain Gordon H. Brown, First Officer William P. Wygant, Second Officer William H. Fortenberry, Flight Engineer Albert F. Pinataro, Purser Oliver E. Crosthwaite, Stewardesses Yvonne L. Alexander and Marie L. McGrath, and Flight Service Supervisor John E. King. The flight plan specified a cruising altitude of 10,000 feet and an airspeed of 226 knots. Gross weight at departure was 147,000 pounds, the maximum allowable, and the weight included fuel for approximately 13 hours. Good weather was forecast for the duration of the flight. All required position reports were made and Clipper 944 reported to Ocean Station vessel "November" at 0030; its position was fixed by radar as 10 miles east of the vessel. The last position report, at 0104, was routine with no indication of anything unusual. The next scheduled position report, due at 0204, was not received and 30 minutes thereafter the flight was designated unreported. Five days later, nine bodies and some debris were find about 147 miles northeast of the estimated point of impact. There were no survivors among the 44 occupants.
Probable cause:
The Board has insufficient tangible evidence at this time to determine the cause of the accident. Further research and investigation is in process concerning the significance of evidence of carbon monoxide in body tissue of the aircraft occupants. The following findings were reported:
- The gross weight of the aircraft at the time of takeoff was 147.000 pounds, the maximum allowable,
- Progress of the flight and position reports were normal and routine for wore than half of the planned flight distance,
- Shortly after the last routine report an emergency of undetermined nature occurred,
- This was followed by a descent from 10.000 feet,
- No emergency message was received from the aircraft,
- Some preparation for ditching was accomplished,¨
- The aircraft broke up on impact,
- A surface fire then occurred,
- Weather was not a factor,
- Exposure of the crew to carbon monoxide was indicated but incapacitation could not be definitely established,
- No evidence of foul play or sabotage was found,
- Irregularities of maintenance practices and/or procedures disclosed during the investigation could not be linked to the accident.
Final Report:

Crash of a Convair R3Y-2 Tradewind off San Francisco

Date & Time: May 10, 1957
Type of aircraft:
Operator:
Registration:
128448
Flight Phase:
Flight Type:
Survivors:
Yes
Crew on board:
0
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
The crew was forced to ditch the airplane in the San Francisco bay following an engine failure in flight. There were no casualties but the aircraft sank and was lost. §
Probable cause:
Engine failure in flight.

Crash of a Boeing 377 Stratocruiser 10-29 into the Pacific Ocean

Date & Time: Oct 16, 1956 at 0615 LT
Type of aircraft:
Operator:
Registration:
N90943
Flight Phase:
Survivors:
Yes
Schedule:
Honolulu – San Francisco
MSN:
15959
YOM:
1949
Flight number:
PA006
Country:
Region:
Crew on board:
7
Crew fatalities:
Pax on board:
24
Pax fatalities:
Other fatalities:
Total fatalities:
0
Captain / Total flying hours:
13089
Captain / Total hours on type:
738.00
Copilot / Total flying hours:
7576
Copilot / Total hours on type:
3674
Aircraft flight hours:
19820
Circumstances:
Trip 6 of October 13 was a regularly scheduled “around-the-world” flight eastbound from Philadelphia, Pennsylvania. to San Francisco, California. with en route stops in Europe, Asia. and various Pacific Islands. All prior segments had been routine and the flight departed Honolulu on the last leg of the -trip on October 15. It was cleared to San Francisco Airport via Green Airway 9, then track to position 30 degrees N. 140 degrees W. at 13,000 feet. the 21,000 feet to San Francisco. There were 24 passengers aboard., including 3 infants, and a crew consisting of Richard N. Ogg, Captain; George L. Haaker. First Officer; Frank Garcia. Jr., Flight Engineer; Richard L. Brown, Navigator; Patricia Reynolds, Purser Mary Ellen Daniel and Katherine S. Araki, Stewardesses. The 8-hour, 54-minute flight was planned IFR and the aircraft carried sufficient fuel for 12 hours. 18 minutes. The gross takeoff weight of the aircraft was 138,903 pounds (maximum allowable 144,000) and the center of gravity was located within limits. N 90943 departed Honolulu at 2026. The climb to initial altitude was normal and the flight proceeded in a routine manner. At OLO2, the approximate midpoint of the flight, a request for VFR climb to its secondary altitude of 21,000 feet was approved by ATC. After reaching 21,000 feet and simultaneously with the reduction of power, the No. 1 engine oversped. Airspeed was immediately reduced by the use of flaps and reduction of power. Attempts were also made to feather the No. 1 propeller. It was impossible to control the engine or to feather the propeller and the captain decided to freeze the engine by cutting off the oil supply. Shortly after this was done there was a momentary decrease in the r. p. m., followed by a heavy thud. The propeller continued to windmill. At this time airspeed had slowed to 150 knots and the aircraft was losing altitude at a rate of approximately 1.000 feet per minute. The captain contacted the U. S. Coast Guard weather station “November” at 0122., alerted it to a possible ditching. and asked assistance. He also alerted the pas angers to the emergency and told them to prepare for a possible water landing. The flight course was altered to "home in” on station “November” and climb power applied to engines Nos. 2, 3, and 4 to cheek the rate of descent. At this time it was noticed that No. 4 engine was only developing partial power at full throttle. At 0125 the flight notified “November” that ditching was imminent and received a ditching heading from the cutter. During the descent the crew found they could maintain altitude at an airspeed of 135 knots with rated power on engines Nos. 2 and 3 and the partial power on No. 4. About 0137 the flight overheated the cutter. Prior to overheating the cutter the maximum range with the fuel remaining had been computed and it was determined to be insufficient either to complete the flight to San Francisco or return to Honolulu. Mortar flares had been fired by the cutter and electric water lights laid to illuminate a ditching track for the aircraft. However, it was decided to postpone the ditching until daylight, if possible. meanwhile remaining close to the cutter. About 0245 the No. 4 engine backfired and power dropped off. Its propeller was feathered normally. The flight was still able to maintain altitude and continued to orbit “November” to burn the fuel aboard down to a minimum while awaiting daylight. At 0540 Captain Ogg notified the U. S. S. Pontchartrain he was preparing to ditch the aircraft. A foam path was laid along the ditching heading of 3150 by the cutter and the aircraft was ditched at 0615. Passengers and crew safely evacuated the aircraft, boarded liferafts, and were completely clear of the aircraft at 0632. The aircraft sank at 0635 at position 30 degrees 01.5’ N. 140 degrees 09’ W.
Probable cause:
The Board determines that the probable cause of this accident was an initial mechanical failure which precluded feathering the No. 1 propeller and a subsequent mechanical failure which resulted in a complete loss of power from the No. 4 engine. the effects of which necessitated a ditching. The following findings were reported:
- The flight was normal until the control of the No. 1 propeller was lost and the engine oversped,
- It was impossible to control the engine speed or to feather the propeller,
- The engine was frozen, however. the propeller became decoupled from the engine and continued to windmill,
- There was a partial power loss on engine No. 4; it subsequently failed completely and the propeller was feathered,
- Airspeed was restricted to 145 knots to prevent the windmilling Propeller from overspeeding,
- Range of the aircraft was so reduced that it was impossible to reach land,
- The passengers were thoroughly instructed in correct emergency procedures and the aircraft was ditched under control with no fatalities,
- Evacuation of the aircraft was well planned and orderly.
Final Report:

Crash of a Douglas DC-6 near Half Moon Bay: 19 killed

Date & Time: Oct 29, 1953 at 0843 LT
Type of aircraft:
Operator:
Registration:
VH-BPE
Survivors:
No
Site:
Schedule:
Sydney – Nadi – Canton – Honolulu – San Francisco
MSN:
43125
YOM:
1948
Flight number:
BCP304
Crew on board:
8
Crew fatalities:
Pax on board:
11
Pax fatalities:
Other fatalities:
Total fatalities:
19
Captain / Total flying hours:
10696
Captain / Total hours on type:
4136.00
Copilot / Total flying hours:
4782
Copilot / Total hours on type:
3896
Aircraft flight hours:
5904
Circumstances:
British Commonwealth Pacific Airlines' Flight 304/44 of October 28. 1953, was scheduled between Sydney, Australia., and San Francisco., California., with intermediate stops at Nadi., Fiji Island, Canton Island., and Honolulu, T. H. The flight to Honolulu was without incident. A routine crew change was effected at Honolulu and the new crew consisted of Captain B. N. Dickson. First Officer F. A. Campbell. Navigator G. R. Murtagh. Radio Officer V. A. Walker, Flight Engineer C. N. Cattanach., Purser W. Knight and Hostesses J. F. Elder and A. K. Lewis. Following a briefing on expected en route and terminal weather by U. S. Weather Bureau personnel: the crew filed an IFR (Instrument Flight Rules) flight plan with ARTC (Air Route Traffic Control) which indicated a rhumb line course was to be flown to San Francisco with Sacramento, California,, the alternate airport. The estimated flying time of the flight was nine hours and 25 minutes and there was 12 hours and 53 minutes of fuel on board. Flight 304/44 departed Honolulu at 2259, October 28, 1953, with 10 adult passengers and one child. According to company records., the gross takeoff weight of the aircraft was 90,166 pounds which was below the allowable gross takeoff weight of 95,200 pounds and the load was properly distributed with respect to the center of gravity of the aircraft. Following departure from Honolulu, the flight called the tower and requested to leave tower frequency. This request was granted. At 2302, the flight again called the tower and reported that it was over Diamond Head requesting permission to return to the airport. At this time the pilot stated, "We're having a little trouble with one of the props." The IFR flight plan was then cancelled. Three minutes later when over the airport the flight reported: "The relay is working okay now; desire to continue flight." Upon receipt of this message., ARTC revalidated the original clearance and the flight proceeded on course. As the flight proceeded toward San Francisco hourly routine position reports were made to OFACS (Overseas Foreign Aeronautical Communication Station). At 0555, the following message was sent by the flight: "VHBPE Position 32.39N 134,40W. Time 13502 (0550). Altitude 11,500. Track 064 degrees. Ground speed 225 knots. Estimating over SFO at 1640Z (0840). Estimating arrival at Blocks 1650Z (0850)." Communications to and from the flight were then changed from CW (code) to voice. In answer to a request from the flight, San Francisco ARTC,, at 0807, cleared it to descend in accordance with Visual Flight Rules and to maintain at least 500 feet on top of clouds. The flight reported that it was starting descent at 0815 and at that time was given the San Francisco 0800 weather: "Measured ceiling 1.200 feet. broken. visibility nine statute miles. temperature 54. dew point 50, wind west 12 knots and altimeter 30.13." As the aircraft approached the coast, it was identified by Western Air Defense Force Radar and released from corridor assignment at 0821. ARTC shortly there after cleared VHBPE as follows: "ATC clears VHBPE to the San Francisco ILS Outer Marker via the Half Moon Bay Fan Marker direct to the San Francisco Outer Marker. Maintain at least 500 feet above all clouds. Contact San Francisco Approach Control after passing Half Moon Bay Fan Marker. Cloud tops reported in the Bay area l.,700 feet." This message was acknowledged and repeated back. The last communication from the flight heard by OFACS was at 0823 when the aircraft reported approximately 60 miles west of the coast. At 0839., the flight called San Francisco Approach Control on 3105 kc., identified itself as "Air Pacific Echo" and advised that it was over Half Moon Bay. 500 on top and was listening on 278 kc. Approach Control acknowledged and gave the following clearance: "Cleared for an ILS approach to the airport, Runway 28, wind west 15; cross the outer marker initial (ly) at least 500 on top, report when inbound; ceiling 1.200, visibility nine. altimeter 30.14." Approximately three minutes later, the flight made a report which was acknowledged by the controller as "Air Pacific Easy., Roger, southeast, turning inbound"; the controller then added. "Cheek passing the ILS outer marker inbound." At 0845, a call to the flight was unanswered as were all subsequent calls. Shortly thereafter, appropriate search and rescue agencies were alerted that the flight was overdue. The wreckage was sighted at 1010, approximately seven and one-half miles southeast of the town of Half Moon Bay. All 19 occupants have been killed.
Probable cause:
The Board determines the probable cause of this accident was the failure of the crew to follow prescribed procedures for an instrument approach. The following findings were reported:
- The clearance given the flight for its instrument approach to San Francisco Airport was proper. was acknowledged. and was read back correctly,
- The radio navigational and landing facilities for this area were functioning normally at the time the approach was being made,
- The accident location was in a mountainous area seven and one-half miles southeast of Half Moon Bay at an elevation of 1,950 feet MSL,
- The weather conditions in the area precluded an approach by means of visual reference to the ground,
- The time element involved would not have permitted the aircraft to have flown from Half Moon Bay Fan Marker to the ILS outer marker and then execute the CAA approved instrument approach procedure,
- The undestroyed wreckage yielded no evidence of mechanical or structural failure of the aircraft prior to impact.
Final Report:

Crash of a Douglas DC-6B off Oakland: 8 killed

Date & Time: Apr 20, 1953 at 2308 LT
Type of aircraft:
Operator:
Registration:
N91303
Survivors:
Yes
Schedule:
Los Angeles – San Francisco – Oakland
MSN:
43823
YOM:
1952
Flight number:
WA636
Crew on board:
5
Crew fatalities:
Pax on board:
5
Pax fatalities:
Other fatalities:
Total fatalities:
8
Captain / Total flying hours:
11500
Captain / Total hours on type:
79.00
Copilot / Total flying hours:
3100
Copilot / Total hours on type:
38
Aircraft flight hours:
826
Circumstances:
The four engine aircraft left San Francisco Airport at 2305LT on a VFR flight to Oakland, distant of 10 miles. At this time, weather conditions were considered as good. On approach to Oakland runway 27R, the pilot-in-command descended below the minimum safe altitude of 500 feet when the aircraft hit the water, exploded and sank into the Bay of Oakland. A stewardess and a passenger were rescued while eight other occupants were killed.
Probable cause:
The Board determines that the probable cause of this accident was the pilot’s action in continuing descent below the 500-feet prescribed minimum altitude until the aircraft struck the water. A probable contributing factor to the aircraft striking the water was the sensory illusion experienced by the pilots. The following findings were pointed out:
- The reported weather conditions at San Francisco and Oakland at the time of departure were above the prescribed minima,
- Actual weather conditions over the Bay at the time and place of the accident were later determined to be below the prescribed minima for trans-bay clearance,
- The pilot of the aircraft failed to comply with the instructions provided in the Visual Trans-Bay procedures which are to be followed in case ceiling and/or visibility below prescribed minima are encountered en route,
- No evidence was found of mechanical malfunction of the aircraft or any of its components recovered,
- The flight descended below minimum specified altitude in an attempt to maintain visual reference.
Final Report:

Crash of a Douglas R5D-1 off San Francisco

Date & Time: Mar 27, 1953 at 0340 LT
Type of aircraft:
Operator:
Registration:
N229A
Flight Phase:
Flight Type:
Survivors:
Yes
Schedule:
Travis – Honolulu
MSN:
10322
YOM:
1944
Crew on board:
3
Crew fatalities:
Pax on board:
1
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
The four engine aircraft left Travis AFB at 2220LT on March 26 on a cargo flight to Honolulu, carrying one passenger and a crew of three. At 0155LT on March 27, while cruising at an altitude of 8,000 feet, the engine number four suffered a loss of hydraulic pressure and was shut down and its propeller was feathered. In such conditions, the captain decided to divert to San Francisco for a precautionary landing when, about an hour later, the manifold pressure of the engine number three dropped. This engine was also shut down and its propeller was feathered as well. Unable to maintain a safe altitude, the crew decided to ditch the aircraft into the Pacific Ocean few miles off San Francisco. All four occupants were rescued while the aircraft sank five hours later.
Probable cause:
Loss of power and manifold pressure issue on engine four en three in flight.

Crash of a Douglas C-54B-10-DO Skymaster near Issaquah: 7 killed

Date & Time: Jan 7, 1953 at 2055 LT
Type of aircraft:
Operator:
Registration:
N86574
Flight Type:
Survivors:
No
Schedule:
Burbank – San Francisco – Seattle
MSN:
18350
YOM:
1944
Flight number:
FT841
Crew on board:
4
Crew fatalities:
Pax on board:
3
Pax fatalities:
Other fatalities:
Total fatalities:
7
Captain / Total flying hours:
8590
Captain / Total hours on type:
2050.00
Copilot / Total flying hours:
3980
Copilot / Total hours on type:
837
Aircraft flight hours:
20078
Circumstances:
Flying Tiger's Flight 841 of January 7, 1953, a ferry flight from Burbank, California, to Seattle, to pick up military personnel, was made in accordance with the company's contract with the Department of National Defense. Departure from Burbank was at 1437, with Captain C. Greber, pilot in command, Captain B. Merrill, and Copilot W. Lowe comprising the crew. Captain H. Wall, chief pilot of the company's Burbank Division, was on board as an observer. The weight of the aircraft at takeoff was 57,520 pounds which was within the maximum allowable gross weight; there was no revenue load. Throughout the segment of the flight to San Francisco, California, Captain Merrill and Captain Lowe flew the aircraft; with the exception of a false fire warning signal from the No. 3 engine nacelle observed in the cockpit shortly after takeoff, the flight to San Francisco was routine. Upon arrival there mechanics checked the fire warning system and found no evidence of a fire having occurred. Captain Merrill told the mechanics that he was satisfied from their inspection there was no danger of fire and that he would not delay the flight further. The malfunctioning fire waning system was not repaired at this time. Captain Wall terminated his flight at San Francisco and a company stewardess, together with a woman passenger and her two children (the wife and children of a company pilot), boarded the aircraft at this point to fly as non-revenue passengers. No fuel or cargo was added at San Francisco. Flight 841 departed San Francisco at 1737 with Captain Greber in command occupying the left pilot's seat and Captain Merrill occupying the copilot's seat. The flight was cleared by ARTC (Air Route Traffic Control) to fly VFR via Amber Airway No. 1 to Williams, California, and IFR from Williams to Boeing Field, Seattle, at an altitude of 11,000 feet MSL. The estimated time en route was three hours and 39 minutes with 1,500 gallons of fuel on board and the Seattle-Tacoma Airport was designated as the alternate. Normal en route position reports were made by the flight and at 1947 it reported being over Eugene, Oregon, at 11,000 feet. Seattle ARTC then cleared the flight to descend to and maintain 9,000 feet until passing Portland, Oregon, and from this point, to descend to and maintain 7,000 feet. At 2036 Flight 841 reported over the McChord radio range station and requested further clearance. Accordingly, ARTC cleared the flight to maintain 7,000 feet, to contact Seattle Approach Control immediately and advised that no delay was expected. Contact was immediately made with approach control; the flight was then cleared to make a standard range approach to Boeing Field and requested to report leaving each 1,000-foot level during the descent. The following weather information was given the flight at this time: "Boeing Field - 1800 scattered, 2200 overcast, 8 miles, wind south-southeast 22, gusts to 30, altimeter 2925; Seattle-Tacoma - measured 1900 broken with 3100 over-cast." Flight 841 acknowledged this clearance and reported leaving 7,000 feet at 2040. Two minutes later, at 2042, it reported being over the outer marker and leaving the 6,000-foot level. No report of leaving the 5,000-foot level was made and at 2045 the flight advised it was leaving 4,000 feet. When the latter was acknowledged by approach control the flight was further advised as follows: "If you're not VFR by the tine you reach the range you can shuttle on the northwest course at 2,000 feet, it's possible you'll break out in the vicinity of Boeing Field for a south landing." The flight acknowledged at 2050 and said it was leaving 3,000 feet. At the time N 86574 was making the approach to Boeing Field, a Pan American DC-4 aircraft was also approaching this airport from the northwest. The latter aircraft had been advised by approach control that it was No. 2 to land behind the Flying Tiger aircraft in the traffic pattern. The Pan American aircraft its making a routine let-down on the northwest leg on the Seattle range and at 2054 reported being at the 3,000-foot level and VFR. Immediately after receiving this altitude report approach control called N 86574 and advised: "You're clear to contact Boeing Tower on 118.3 for landing instructions." This was acknowledged by "Roger" and was the last known contact with the Flying Tiger aircraft. At approximately 2055, N 86574 crashed about 11 miles east of the Seattle range station at the base of Squak Mountain. All seven occupants were killed and the aircraft was demolished by impact and the ensuing fire.
Probable cause:
The Board determines that the probable cause of this accident was the flight's deviation from the established approach procedure to Boeing Field. The following findings were pointed out:
- Although instrument weather conditions prevailed at the time of the approach to Seattle, no unusual weather existed which should have prevented the approach being made according to approved procedures,
- The pilot of the aircraft deviated from the established approach procedure by flying 11 miles to the east of course,
- All round navigational ads were functioning normally,
- There was no indication of fire or malfunctioning of the aircraft or any of its components prior to first impact.
Final Report:

Crash of a Boeing 377 Stratocruiser off Redwood City: 3 killed

Date & Time: Sep 12, 1951 at 1146 LT
Type of aircraft:
Operator:
Registration:
N31230
Flight Type:
Survivors:
No
Schedule:
San Francisco – Oakland – San Francisco
MSN:
15970
YOM:
1949
Flight number:
UA7030
Crew on board:
3
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
3
Captain / Total flying hours:
17384
Captain / Total hours on type:
572.00
Copilot / Total flying hours:
16390
Copilot / Total hours on type:
346
Aircraft flight hours:
1971
Circumstances:
The flight departed San Francisco at 1042, operating as "United Trainer 7030." Flight Manager Frederick S. Angstadt was captain and was being given his semi-annual instrument check by Assistant Flight Manager Hugh C. Worthington, who served as copilot. Flight Engineer Charles K. Brogden was the third crew member. In addition to the foregoing instrument check, consideration had been given to investigating the feasibility of using the Oakland, California, Municipal Airport for certain phases of crew training in this type aircraft for a new class of pilots and flight engineers which was to convene that afternoon. Captains Angstadt and Worthington were to supervise this training. United Air Lines' officials stated that Captains Angstadt and Worthington intended to make this determination during the flight. Captain Angstadt was given the 0928 sequence weather reports for the local area prior to completing a clearance form at the UAL dispatcher's office. Pertinent weather was as follows: stratus clouds in the Bay area with tops at approximately 1,600 feet; San Francisco and Oakland - 800 foot ceiling, overcast, visibility three miles, haze and smoke; ceiling and visibility at Fresno and Sacramento unlimited. The forecast for the Bay area indicated scattered clouds by 1100 PST. Clearance was issued for local flight under Visual Flight Rules (VFR), confined to a 100-mile radius from San Francisco and under 10,000 feet. The load was properly distributed with respect to permissible center of gravity limits. Gross weight of the aircraft at takeoff was 114,886 pounds with 4,700 gallons of fuel, well under the maximum permissible gross takeoff weight. After reporting on top of the broken scattered clouds to the San Francisco tower at 1046, the flight proceeded to Oakland. The Oakland tower approved a simulated Instrument Landing System approach; this and a missed approach procedure were performed. The flight again reported on top at 1136. Another simulated ILS approach was requested of the Oakland tower but the flight was advised that there would be a delay due to other traffic. In view of this, the pilot decided to return to San Francisco. The flight changed frequency from the Oakland tower to San Francisco Approach Control at 1137. At 1139, the flight was cleared for an ILS approach to the San Francisco Airport, but did not acknowledge the clearance on the 119.1 megacycle Approach Control frequency. Following two attempts to contact the flight, the controller heard the aircraft make an unreadable call on 121.9 megacycles, and instructed the flight to listen on 119.1. This transmission was followed by further instruction for the flight to hold VFR, and stand by. The frequency change was apparently accomplished by the flight and the pilot again requested permission to make a simulated ILS approach. The request was granted, with instructions to report upon leaving the ILS outer marker inbound. This message and one other were not acknowledged by the flight. No emergency call was received from the aircraft. The crash was reported to the U. S. Coast Guard Air Station at 1046 by the manager of a nearby airport.
Probable cause:
The Board determines that the probable cause of this accident was an inadvertent stall at a low altitude from which recovery was not effected. The following findings were pointed out:
- The aircraft, with No. 4 propeller feathered, stalled and abruptly dived from an altitude of approximately 300 feet and was demolished upon impact in San Francisco Bay,
- Engines Nos. 1, 2, and 3 were developing power at the time of impact,
- The No. 4 propeller was feathered; however, there was no evidence found of structural failure or malfunctioning of this engine or its propeller,
- The landing gear was extended and wing flaps were down 10 degrees at time of impact,
- About 75 per cent of the aircraft was recovered; no evidence of fire fuel or electrical system malfunction, or structural failure in flight,
- The cause of the stall was not definitely determined.
Final Report:

Crash of a Curtiss C-46E-1-CS Commando in Newhall

Date & Time: Feb 23, 1951
Type of aircraft:
Operator:
Registration:
N59490
Flight Type:
Survivors:
Yes
Schedule:
Burbank – San Francisco
MSN:
2942
YOM:
1945
Crew on board:
3
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
En route to San Francisco, the crew encountered severe icing conditions and received the permission to return to Burbank. Shortly later, the pilot realized this was not possible and reduced his altitude in an attempt to make an emergency landing. The aircraft belly landed in a field located along a highway in Newhall. The aircraft slid on the ground and hit an electric pole before coming to rest. All three crew members were unhurt while the aircraft was damaged beyond repair.