Boeing 727-100

Alaska Airlines, Flight 1866 (AS66) was a scheduled passenger flight from Anchorage (ANC), to Seattle (SEA), with intermediate stops at Cordova (CDV), Yakutat (YAK), Juneau (JNU), and Sitka (SIT). The IFR flight departed Anchorage at 09:13 and landed at Cordova at 09:42. AS66 departed Cordova at 10:34 after a delay, part of which was attributable to difficulty in securing a cargo compartment door. The flight landed at Yakutat at 11:07. While on the ground, AS66 received an air traffic control clearance to the Juneau Airport via Jet Route 507 to the Pleasant Intersection, direct to Juneau, to maintain 9,000 feet or below until 15 miles southeast of Yakutat on course, then to climb to and maintain FL230. The flight departed Yakutat at 11:35, with 104 passengers and seven crew members on board. At 11:46, AS66 contacted the Anchorage ARTCC and reported level at FL230, 65 miles east of Yakutat. The flight was then cleared to descend at the pilot's discretion to maintain 10,000 ft so as to cross the Pleasant Intersection at 10,000 feet and was issued a clearance limit to the Howard Intersection. The clearance was acknowledged correctly by the captain and the controller provided the Juneau altimeter setting of 29.46 inches and requested AS66 to report leaving 11,000 ft. At 11:51, AS66 reported leaving FL230. Following this report, the flight's clearance limit was changed to the Pleasant Intersection. At 11:54, the controller instructed AS66 to maintain 12,000 feet. Approximately 1 minute later, the flight reported level at 12,000 feet. The changes to the flight's original clearance to the Howard Intersection were explained to AS66 by the controller as follows: "I've got an airplane that's not following his clearance, I've got to find out where he is." The controller was referring to N799Y, a Piper Apache which had departed Juneau at 11:44 on an IFR clearance, destination Whitehorse, Canada. On two separate occasions, AS66 acted as communications relay between the controller and N799Y. At 11:58, AS66 reported that they were at the Pleasant Intersection, entering the holding pattern, whereupon the controller recleared the flight to Howard Intersection via the Juneau localizer. In response to the controller's query as to whether the flight was "on top" at 12,000 feet, the captain stated that the flight was "on instruments." At 12:00, the controller repeated the flight's clearance to hold at Howard Intersection and issued an expected approach time of 12:10. At 12:01, AS66 reported that they were at Howard, holding 12,000 feet. Six minutes later, AS66 was queried with respect to the flight's direction of holding and its position in the holding pattern. When the controller was advised that the flight had just completed its inbound turn and was on the localizer, inbound to Howard, he cleared AS66 for a straight-in LDA approach, to cross Howard at or below 9,000 feet inbound. The captain acknowledged the clearance and reported leaving 12,000 feet. At 12:08 the captain reported "leaving five thousand five ... four thousand five hundred," whereupon the controller instructed AS66 to contact Juneau Tower. Contact with the tower was established shortly thereafter when the captain reported, "Alaska sixty-six Barlow inbound." (Barlow Intersection is located about 10 nautical miles west of the Juneau Airport). The Juneau Tower Controller responded, "Alaska 66, understand, ah, I didn't, ah, copy the intersection, landing runway 08, the wind 080° at 22 occasional gusts to 28, the altimeter now 29.47, time is 09 1/2, call us by Barlow". No further communication was heard from the flight. The Boeing 727 impacted the easterly slope of a canyon in the Chilkat Range of the Tongass National Forest at the 2475-foot level. The aircraft disintegrated on impact. The accident was no survivable.

On final approach to runway 23L at Mexico City-Benito Juárez Airport, the three engine airplane lost height and struck the ground about 1,5 km short of runway threshold. It bounced and became airborne again when the nose gear and the forward fuselage struck a railway embankment. Out of control, the airplane crashed and broke into several pieces near the runway threshold. 80 people were wounded while 15 others were uninjured. Five crew members and 22 passengers were killed. The aircraft was destroyed.

Following an uneventful flight from Mexico City, the crew started the descent to Monterrey-General Mariano Escobido Airport. In a visibility reduced by heavy rain falls, the crew initiated a turn to the left to intercept the glide. After passing over the Monterrey VOR, the aircraft descended with a rate of 1,500 feet per minute when, at a speed of 250 knots, it struck the slope of Cerro del Fraile located some 23 km from the airport. The aircraft disintegrated on impact and all 79 occupants were killed. The wreckage was found at an altitude of 1,800 meters few hours later.

Flight 160 was a scheduled international flight from Buenos Aires, Argentina to Santiago, Chile. The aircraft took off at 2356 hours GMT from Ezeiza Airport, with an IFR flight plan for airways AJG 82 and UG-14, and left the Buenos Aires terminal area via the Mariana intersection, its route taking it over Junín, Villa Reynolds, El Pencal, Mendoza, Juncal and Tabón. The flight level was 310 (31 000 ft). Before flying over Juncal, the aircraft was cleared by the Mendoza Control Centre to descend and maintain flight level 260 (26 000 ft) and after passing Juncal, it was cleared by the Santiago Control Centre to descend and maintain level 250 (25 000 ft) and to pass the Tab6n NDB at flight level 150. It was also given the Santiago weather report, announcing 4/8 nimbostratus at 450 m and 8/8 altostratus at 2 400 m. At 0135 hours, the aircraft passed over Juncal at flight level 260 and then left this level for FL 150; it gave 0142 hours at its estimated time of passage over Tabón NDB and subsequently reported that it was passing through FL 180 (18 000 ft). At 0141 hours, the aircraft passed Tabón NDB and left FL 150 for FL 70 (7 000 ft) and gave 0142 hours as its estimated time of arrival over Colina NDB. Prior to that, Santiago Centre had cleared the aircraft to FL 70 at the Pudahuel Airport ILS outer marker. The aircraft subsequently reported to the Control Centre that it was passing through FL 70; the Centre acknowledged receipt of the message and cleared the flight to make an ILS approach and to change to frequency 118.1 for communication with the Pudahuel Control Tower. The aircraft passed over Colina NDB at about 5 500 ft and continued to descend intercepting the ILS (glide slope) beam at about 4 500 ft, one min 20 sec after passing FL 70. It continued its descent at a rate of about 1 500/2 000 ft/min and descended below the minimum height of 2 829 ft at the outer marker without either the pilot or the co-pilot noting this and on apparently correct indications from the Flight Director. The aircraft continued descending and passed below the minimum height of 1 749 ft published for Pudahuel Airport when suddenly the warning light on the radio altimeter lit up. At this very moment the aircraft levelled off, but its wheels touched the ground and it landed in a field 2 kms north of the ILS outer marker, suffering heavy damage, but without serious injuries to passengers or crew. The accident occurred at 0144 GMT on 28 April, 2144LT on 27 April.

Boeing 727-22C N7434U operated Flight 266 from Los Angeles to Denver, CO and Milwaukee, WI. The aircraft had been operating since January 15, 1969, with the No. 3 generator inoperative. This was allowed because according to the Minimum Equipment List, the aircraft is airworthy with only two generators operable provided certain procedures are followed and electrical loads are monitored during flight. Flight 266 was scheduled to depart the gate at 17:55, but was delayed until 18:07 because of the inclement weather and loading problems. The flight commenced its takeoff roll on runway 24 at approximately 18:17. At 18:18:30 the sound of an engine fire warning bell was heard in the cockpit. The crew reported a no. 1 engine fire warning and stated that they wanted to return to the airport. Shortly after shutdown of the No. 1 engine, electrical power from the remaining generator (No. 2) was lost. Following loss of all generator power, the standby electrical system either was not activated or failed to function. Electrical power at a voltage level of approximately 50 volts was restored approximately a minute and a half after loss of the No. 2 generator. The duration of this power restoration was just 9 to 15 seconds. The Boeing descended and struck the sea 11.3 miles west of the airport. The ocean depth at this point is approximately 950 feet.

The accident occurred on a scheduled passenger flight from Frankfurt when the aircraft was making an ILS approach for a night landing on Runway 27 at Gatwick Airport. The weather was clear except that freezing fog persisted in places including the Gatwick area. The runway visual range (RVR) at Gatwick was 100 metres. The approach was commenced with the autopilot coupled to the instrument landing system (ILS) but after the glide-slope had been captured the commander who was at the controls, disconnected the autopilot because the "stabiliser out of trim" warning light illuminated. At the outer marker the flap setting was changed from 1° to 30° and shortly afterwards the rate of descent increased and the aircraft descended below the glide-slope. Some 200 feet from the ground the pilot realised that the aircraft was too low and initiated a missed approach procedure. The aircraft began to respond but the descent was not arrested in time to avoid a collision with trees and a house that destroyed both the aircraft and the house and set the wreckage on fire. 48 occupants as well as two people in the house were killed. 14 others were injured. The aircraft was totally destroyed by impact forces and a post crash fire.

The takeoff warning horn sounded shortly after commencing takeoff from runway 09R. The takeoff was continued as the crew tried to figure out what caused the warning. The horn ceased prior to reaching rotate speed. The stick shaker came on and thrust was added, but the aircraft failed to climb and the captain elected to discontinue the takeoff. The 727 settled back to the macadam shoulder off the right side of the runway and struck a ditch, coming to rest 1,100 feet beyond the runway end and 300 feet right of the extended centreline. The aircraft was destroyed by a post crash fire and all three crew members were injured. The flaps had been set at 2° instead of takeoff range of 5°-25°.

Flight No. 10 operated by Civil Air Transport was a scheduled international flight from Taipei to Hong Kong and return. The accident occurred on the return trip from Hong Kong to Taipei. The aircraft departed Hong Kong at 2018 hours local time. At 2045 hours it reported to Taipei Area Control Centre over Yellowtail, a compulsory reporting intersection, at flight level 29 000 ft. At 2059 hours it reported over Makung VOR, and was then cleared to descend to 11 000 ft. At 2111 hours it reported over Hsinchu (PO) NDB at 11 000 ft and was cleared to descend to 5 000 ft crossing Taoyuan (GM) NDB and to 2 000 ft crossing Linkuo outer marker for a straight-in ILS approach to runway 10. The current Taipei weather information was also given to the pilot at that time. At 2118 hours the aircraft reported approaching Linkuo outer marker at 2 000 ft and was cleared to continue its ILS approach and to contact Taipei Tower. The aircraft reported to Taipei Tower and requested landing instructions. The tower controller advised the pilot to continue his ILS approach to runway 10, gave him the surface wind and the altimeter setting and requested him to report approach lights in sight. The pilot acknowledged all this information. From that moment, even though repeated attempts to contact the aircraft were made by Taipei Tower and Taipei Area Control Centre, no further communication was received from the aircraft. Then, right after, Taipei Area Control Centre was informed that the aircraft had crashed in the vicinity of Linkou, about 8 miles west of Taipei City. Three crew members, 18 passengers and one person on the ground were killed. The aircraft was destroyed. It was found during the investigation that the left hand pilot seat was not occupied by the assigned pilot-in-command, but by another Senior Pilot of Civil Air Transport.

The three engine aircraft departed Asheville Regional Airport at 1158LT and climbed to its assigned altitude. About three minutes later, while climbing to an altitude of 6,132 feet in a limited visibility due to clouds, the aircraft collided with a Cessna 310 registered N3121S. Operated by Lanseair, it was carrying two passengers and a pilot. Following the collision, both aircraft dove into the ground and crashed in a dense wooded area located about nine miles southeast of Asheville Airport. The wreckage of the 727 was found in a forest along a highway located in Hendersonville. All 82 occupants in both aircraft were killed.

Pan Am's scheduled cargo flight 708 from Frankfurt to Berlin usually lands at Tempelhof Airport. However because of resurfacing of the runways at Tempelhof, Pan Am operated in and out of Tegel Airport since the evening of November 13th. Flight 708 departed Frankfurt at 02:04 and climbed to the cruising altitude of FL90. At 02:35 the flight reported leaving this altitude for FL30. Three minutes later Berlin Control cleared the flight to "turn left heading zero three zero, descend and maintain two thousand". When 6,5 miles from the Outer Marker, the controller cleared the flight to "turn right heading zero six zero cleared ILS runway eight right approach". Immediately after the acknowledgment from the flight crew, the aircraft struck the ground and crashed about 10 miles from the airport in the Soviet occupation zone. Weather was poor with 2,6 km visibility in snow; cloud coverage 3/8 at 500 feet and overcast a 600 feet with a temperature of -1deg C. The Soviet authorities returned about 50 percent of the wreckage. Some major components were not returned which included the flight data and cockpit voice recorders, flight control systems, navigation and communication equipment.