ASN Wikibase Occurrence # 40496
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| Date: | Saturday 14 September 1996 |
| Time: | 14:00 LT |
| Type: |  Mudry CAP 10B |
| Owner/operator: | Heale, Robert H. |
| Registration: | N25AK |
| MSN: | 56 |
| Total airframe hrs: | 1879 hours |
| Engine model: | Lycoming AEIO-360-B2F |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Fairchild Afb, WA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | , WA (KSKA) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During recovery from a left hammerhead stall, the pilot of a French-built Mudry CAP 10B transmitted that he had a locked control. At about that time, the airplane entered a steep right bank and began descending. It remained in a descending turn for three steeply banked 360 degree right turns, then it impacted the ground. Videotapes revealed rudder and elevator movements during the descending turn, but no aileron movement was seen from the time the pilot said he had a locked control until the airplane hit the ground. Investigation revealed two three-wire electrical bundles in each wing, which had been routed to the wingtip strobe lights and the wingtip smoke canister activation system. These created a resistance to movement of the aileron pushpull tubes. The right wing wire bundles had been routed through the center of the right aileron bellcrank mechanism. Testing revealed that the wire bundles in the right wing could become lodged in the bellcrank mechanism, and could jam the ailerons in a position that would cause the airplane to roll to the right. Flight tests simulating this condition in another CAP 10B confirmed that the airplane was not controllable when the ailerons were jammed in such a position. The manufacturer reported that the 1975 model airplane was not equipped with strobe lights or a smoke canister system when it left the factory. The investigation did not determine who had routed the bundles through the right bellcrank or for how long they had been in that location.
Probable Cause: loss of control due to a jammed aileron pushpull tube, due to improper installation/routing of electrical wire bundles through the right aileron bellcrank mechanism by unknown person(s).
Accident investigation:
 |
|
Sources:
NTSB SEA96FA214
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 08-Apr-2024 18:59 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Source, Narrative, Category, Accident report] |
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