Crash of a PZL-Mielec AN-28 in Weston-on-the-Green

Date & Time: Aug 28, 1993 at 1620 LT
Type of aircraft:
Registration:
HA-LAJ
Flight Phase:
Survivors:
Yes
Schedule:
Weston-on-the-Green - Weston-on-the-Green
MSN:
1AJ005-11
YOM:
1988
Region:
Crew on board:
2
Crew fatalities:
Pax on board:
17
Pax fatalities:
Other fatalities:
Total fatalities:
0
Captain / Total flying hours:
9400
Captain / Total hours on type:
1200.00
Copilot / Total flying hours:
2310
Copilot / Total hours on type:
510
Aircraft flight hours:
1616
Aircraft flight cycles:
1384
Circumstances:
The twin engine aircraft was engaged in a local skydiving mission, carrying 17 skydivers and two pilots. After takeoff, while climbing, both engines simultaneously suffered a total power loss. The commander reported that the simultaneous failure did not induce any yaw and that the only two warning lights which illuminated in the cockpit were those indicative of double engine failure. Following the power loss, the aircraft's speed decayed rapidly leading the commander to suspect that the automatic outboard wing spoilers had also deployed. Realising that a forced landing was the only option available to him, he initiated a steep descent to maintain airspeed and a turn through 90° to the right to position the aircraft for a forced landing in a large field of corn stubble. The aircraft landed heavily in a slightly nose up attitude, banked slightly to the right, at an estimated speed of 170 km/h (92 knots) and slid to rest with substantial damage to the fuselage, landing gear, wing struts, propellers and wings. All 19 occupants evacuated the cabin and were uninjured.
Probable cause:
The following findings were reported:
- A latent defect in the electrical system caused a simultaneous total power loss as the flaps were retracted at 500 feet agl on climb out, with automatic operation of both asymmetric spoiler systems.
- The latent defect had been caused by progressive loosening of a single earthing screw, which provided a common earth point for the flap electric signalling and propeller auto feathering systems. This induced a high resistance to earth at this point and caused feathering of both propellers when flap retraction was selected, in addition to automatic closure of both engine fuel shut-off valves (within the fuel control units) and extension of both outboard spoilers.
- At manufacture in Poland a single earthing point had been installed which was not in accordance with the design requirements for this aircraft type as issued by the Antonov Design Bureau, which had required dual combined earthing terminals for the flap signalling and propeller auto feathering systems.
- The Antonov Design Bureau had never cleared this type of aircraft for flight with the aft clam-shell doors removed, or for parachute training.
- This aircraft had been incorrectly granted an Aerial Work Permit for parachuting operations in the UK by the Department of Transport, assisted by the CAA, as a result of implicit reliance upon submitted documentation which was subsequently proven invalid.
Final Report:

Crash of an Antonov AN-2 in Byngi: 1 killed

Date & Time: Jul 2, 1993
Type of aircraft:
Operator:
Flight Phase:
Survivors:
Yes
Schedule:
Byngi - Byngi
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
5
Pax fatalities:
Other fatalities:
Total fatalities:
1
Circumstances:
The aircraft was engaged in a local skydiving mission. Shortly after takeoff, while climbing to a height of about 30 metres, the engine failed. The pilot attempted an emergency landing when the aircraft crashed, bursting into flames. A skydiver was killed while four others and the pilot were injured.
Probable cause:
Complete engine failure during initial climb for unknown reasons.

Crash of a Douglas C-47B-DK in Zephyrhills

Date & Time: Apr 20, 1993 at 1624 LT
Operator:
Registration:
N8056
Flight Phase:
Survivors:
Yes
Schedule:
Zephyrhills - Zephyrhills
MSN:
14290/25735
YOM:
1944
Crew on board:
2
Crew fatalities:
Pax on board:
40
Pax fatalities:
Other fatalities:
Total fatalities:
0
Captain / Total flying hours:
8500
Captain / Total hours on type:
4150.00
Aircraft flight hours:
16891
Circumstances:
The pilot stated that on initial climb, at about 400 feet agl, the crew smelled something burning, followed by light smoke in the cabin. Both engines appeared normal visually. The odor and smoke increased, and the left fire warning light illuminated. The left engine was shut down and the prop feathered. The pilot increased power on the right engine; however, the airplane would not climb or maintain airspeed. A gear and flaps up forced landing was made into a field. The pilot stated that he believed an exhaust clamp broke allowing a segment of exhaust to scorch cowling and activate the fire warning system. Examination of the left engine revealed that the lower fire detection elements were fused and broken free, and that the hydraulic lines were burned through.
Probable cause:
The pilot-in-command's failure to maintain best single-engine rate-of-climb speed which resulted in a forced landing. A factor which contributed to the accident was a possible exhaust system clamp failure.
Final Report:

Crash of a PZL-Mielec AN-2T in Tushino

Date & Time: Jan 21, 1993
Type of aircraft:
Operator:
Registration:
26 black
Flight Phase:
Survivors:
Yes
Schedule:
Tushino - Tushino
MSN:
1G236-01
YOM:
1989
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
10
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
While engaged in a skydiving mission out from Tushino Airport, the pilot started the takeoff run before all skydivers were seated, so they were thrown into the back of the cabin. At liftoff, the center of gravity was out of the envelope (too far aft). The aircraft stalled and crashed. The pilot and all 10 passengers escaped unhurt while the aircraft was damaged beyond repair.
Probable cause:
For unknown reasons, the pilot precipitated the takeoff procedure.

Crash of a Beechcraft C-45G Expeditor in Hinckley: 12 killed

Date & Time: Sep 7, 1992 at 1240 LT
Type of aircraft:
Operator:
Registration:
N3657G
Flight Phase:
Survivors:
No
Schedule:
Hinckley - Hinckley
MSN:
AF-461
YOM:
1951
Crew on board:
1
Crew fatalities:
Pax on board:
11
Pax fatalities:
Other fatalities:
Total fatalities:
12
Captain / Total flying hours:
3030
Captain / Total hours on type:
867.00
Aircraft flight hours:
7780
Circumstances:
After takeoff, the airplane was seen at low altitude trailing smoke from the left engine. Witnesses saw the wings 'tipping' back and forth, then a wing dropped and hit the ground. Examination revealed that a supercharger bearing had failed in the left engine. The left engine had been recently installed by non-certificated personnel after being inactive for 18 years without preservation. The airplane had flown about 184 hours since the last annual inspection; no record of subsequent 100-hr inspection. The left prop blades were found in an intermediate position between the operating range and the feathered position. The left prop was changed several weeks prior to the accident. There is no evidence that the left prop had ever been successfully cycled to the full feather position. The operator and pilots were not aware of hamilton standard SB 657 recommending full-feather checks every 30 days. Left prop feathering motor relays not recovered. All 11 parachutists were found in center part of fuselage; no evidence of restraint usage. All 12 occupants were killed.
Probable cause:
Inadequate maintenance and inspection by the operator which resulted in an engine power loss during the critical takeoff phase of flight. In addition, the pilot did not, or was unable to, attain a full feather position on the left engine propeller, which would have most likely enabled the airplane to sustain minimum control airspeed.
Final Report:

Crash of a Fairchild C-123K Provider near Metapán: 14 killed

Date & Time: Aug 27, 1992 at 0945 LT
Type of aircraft:
Operator:
Registration:
FAS121
Flight Phase:
Survivors:
No
Site:
MSN:
20192
YOM:
1955
Country:
Crew on board:
4
Crew fatalities:
Pax on board:
10
Pax fatalities:
Other fatalities:
Total fatalities:
14
Circumstances:
While flying at low height, the aircraft suffered an engine failure. The crew lost control of the airplane that crashed in a wooded and hilly terrain, bursting into flames. All 4 crew members and 10 paratroopers were killed.

Crash of a De Havilland DHC-6 Twin Otter 200 in Perris Valley: 16 killed

Date & Time: Apr 22, 1992 at 1109 LT
Operator:
Registration:
N141PV
Flight Phase:
Survivors:
Yes
Schedule:
Perris Valley - Perris Valley
MSN:
141
YOM:
1968
Crew on board:
2
Crew fatalities:
Pax on board:
20
Pax fatalities:
Other fatalities:
Total fatalities:
16
Captain / Total flying hours:
4300
Captain / Total hours on type:
100.00
Aircraft flight hours:
29391
Circumstances:
The ground loader had fueled the airplane from the airport fuel truck. He stated that the flight crew did not sump the fuel tanks after they were fueled. Immediately after takeoff the right engine lost power, the right wing lowered to about 90°, and the airplane impacted the ground adjacent to the runway. Then forward fuel tank, which provides fuel to the right engine, was found to contain about 8 gallons of a heavily contaminated mixture composed of water, an emulsifying agent, and bacterial growth. The fuel from the airport fuel truck and main underground tank contained the same mixture. Fuel had been transferred from the underground tank to the truck on the evening preceding the accident. The left propeller control was found seized in the feather position; left propeller blades in the near feather position. Six skydivers were injured while 16 other occupants including both pilots were killed.
Probable cause:
The pilot-in-command's inadvertent feathering of the wrong propeller following an engine power loss, and the failure of the operator to assure that the pilot was provided with adequate training in the airplane. Factors related to the accident were: water contamination of fuel in the airport storage tanks, the operator's lack of fuel quality control procedures, improper fuel servicing, improper preflight by the pilot(s), and exceeding the gross weight/forward cg limits of the airplane.
Final Report:

Crash of a Pilatus PC-6/B1-H2 Turbo Porter in Jaspers Brush: 2 killed

Date & Time: Nov 12, 1991
Operator:
Registration:
A14-683
Flight Phase:
Survivors:
Yes
Schedule:
Jaspers Brush - Jaspers Brush
MSN:
683
YOM:
1968
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
9
Pax fatalities:
Other fatalities:
Total fatalities:
2
Aircraft flight hours:
7415
Circumstances:
Crashed in unknown circumstances after takeoff from Jaspers Brush Airfield. Two occupants were killed and eight others were injured.

Crash of a Pilatus PC-6/B1-H2 Turbo Porter in Lobos: 6 killed

Date & Time: Nov 9, 1991
Operator:
Registration:
0685/4-G-1
Flight Phase:
Survivors:
Yes
Schedule:
Lobos - Lobos
MSN:
2046
YOM:
1971
Country:
Crew on board:
2
Crew fatalities:
Pax on board:
6
Pax fatalities:
Other fatalities:
Total fatalities:
6
Circumstances:
The single engine aircraft was dispatched at Lobos airfield for local skydiving mission. Shortly after takeoff from a grassy runway, the aircraft crashed in unknown circumstances. Two skydivers were seriously injured while six other occupants were killed.

Crash of a Partenavia P.68B Victor in Kalundborg

Date & Time: Sep 28, 1991 at 1110 LT
Type of aircraft:
Operator:
Registration:
OY-CEW
Flight Phase:
Survivors:
Yes
Schedule:
Kalundborg - Kalundborg
MSN:
30
YOM:
1974
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
6
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
The twin engine aircraft successfully completed three sortie in the morning. With six skydivers on board, the pilot prepared for a fourth mission when, during the takeoff roll, he realized he could not make it. He aborted the takeoff procedure and saw people at the end of the runway so he voluntarily veered off runway to the right. While contacting soft ground, the nose gear collapsed and the aircraft came to rest with its left wing partially torn off. All six passengers were evacuated safely while the pilot was slightly injured.
Probable cause:
Takeoff interruption on part of the pilot due to an insufficient speed. The exact cause of the mishap remains unclear.