De Havilland DHC-6-100 N100AP
14 April 1989 · Barrow, Alaska, United States · No injuries
Summary
On 14 April 1989 at about 01:05 local time, a De Havilland DHC-6-100 registered N100AP was involved in an incident near Barrow, Alaska, United States. 7 people were on board and nobody was injured. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 01:05
- Classification
- Incident
- Location
- Barrow, Alaska, United States
- Nearest airport
- Wiley Post (BRW)
- Coordinates
- 71.2806, -156.7790
- Aircraft
- De Havilland DHC-6-100
- Registration
- N100AP
- Category
- Airplane
- Engines
- 2
- Operator
- Not recorded
- Operating rule
- Part 135: Air Taxi & Commuter
- Purpose of flight
- Unknown
- Phase of flight
- Not recorded
- Route
- Unknown → Atqasuk
- Aircraft damage
- Not recorded
- Weather
- VMC
- Light
- Day
- NTSB number
- ANC89IA059
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 7 | 0 | 0 | 0 | 7 |
Probable cause
THE PROPAGATION OF A FATIGUE CRACK FROM MULTIPLE ORIGINS DUE TO MANUFACTURING DEFECTS IN THE ELEVATOR BELLCRANK MOUNTING QUADRANT.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
THE AIRPLANE HAD JUST DEPARTED BARROW, AK, ON A SCHEDULED COMMUTER FLIGHT WITH FIVE PASSENGERS AND TWO CREW MEMBERS ON BOARD. UPON REACHING AN ALTITUDE OF 150 AGL, THE CONTROL YOKE WAS PULLED FORWARD OUT OF THE CAPTAIN'S HANDS AND PINNED AGAINST THE CONTROL PANEL. SIMULTANEOUSLY, THE NOSE OF THE AIRPLANE SUDDENLY PITCHED UP 60 DEGREES ABOVE THE HORIZON. THE CAPTAIN REDUCED POWER AND THE NOSE PITCHED 30 DEGREES BELOW THE HORIZON. THE FLIGHT CREW WAS EVENTUALLY ABLE TO MAINTAIN A LEVEL ATTITUDE BY POWER ADJUSTMENTS ALONE, AND RETURNED FOR A SAFE LANDING. INSPECTION REVEALED A FATIGUE FRACTURED ELEVATOR BELLCRANK MOUNTING QUADRANT, P/N C6CFM1142-1, RESULTING IN A COMPLETE LOSS OF ELEVATOR CONTROL. THE ELEVATOR BELLCRANK MOUNTING QUADRANT HAD BEEN IN SERVICE SINCE 1966 AND HAD BEEN OPERATING 17,826 HRS. THE FRACTURE OCCURRED BETWEEN THE VERTICAL STABILIZER STUB FIN ATTACHMENT BULKHEAD AND THE BELLCRANK. METALLURGICAL EXAM REVEALED MULTIPLE FATIGUE ORIGINS IN THE VICINITY OF SUPERFICIAL MACHINING ABRASIONS.
Quoted verbatim from the NTSB record.
Other De Havilland DHC-6 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 27 Sep 1989 | De Havilland DHC-6-300 | Grand Canyon, Arizona, United States | - | Fatal | 10 |
| 29 Oct 1989 | De Havilland DHC-6-300 | Halawa, Molokai, Hawaii, United States | - | Fatal | 20 |
| 19 Sep 1989 | De Havilland DHC-6 | Sleepy Bay, Alaska, United States | Sound Adventures | No injuries | - |
| 17 Jun 1988 | De Havilland DHC-6-100 | Tau, American Samoa | Somoa Aviation | Serious injuries | - |
| 29 Mar 1990 | De Havilland DHC-6 | Chevak, Alaska, United States | - | No injuries | - |
| 9 Dec 1990 | De Havilland DHC-6-100 | Perris Valley, California, United States | One Papa Mike Corp. | Minor injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 9 Mar 1989 | Piper PA-32 | Kasigluk, Alaska, United States | - | No injuries | - |
| 9 Mar 1989 | Cessna 185E | Alexander Lake, Alaska, United States | - | No injuries | - |
| 16 Mar 1989 | Aeronca 15AC | Fairbanks, Alaska, United States | - | No injuries | - |
| 25 Mar 1989 | Cessna 180-A | Skwentna, Alaska, United States | - | No injuries | - |
| 12 Apr 1989 | Cessna 185 | Trinity Lake, Alaska, United States | - | No injuries | - |
| 17 Apr 1989 | Cessna 152 | Kenai, Alaska, United States | - | No injuries | - |