ASN Wikibase Occurrence # 41021
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| Date: | Friday 4 August 1995 |
| Time: | 09:26 LT |
| Type: | Peregrine PJ-2 |
| Owner/operator: | Fox Aircraft Corp. |
| Registration: | N62PJ |
| MSN: | 001 |
| Total airframe hrs: | 34 hours |
| Engine model: | GE J85-17A |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Minden, NV -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | (KMEV) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE AIRCRAFT WAS ON A DEVELOPMENTAL FLIGHT TEST PROGRAM. THE PILOT REPORTED A SPLIT FLAP SITUATION DURING THE GO-AROUND. WITNESSES OBSERVED THE AIRPLANE TURN ONTO A LEFT CROSSWIND, THEN BEGIN A RIGHT ROLL TO GROUND IMPACT. A PIN IN THE LEFT FLAP DRIVE WAS FOUND SHEARED. THE PIN WAS EXAMINED AND FOUND TO MEET THE MANUFACTURER'S MATERIAL SPECIFICATIONS. IT WAS DETERMINED THE PIN HAD FAILED DUE TO OVERLOAD SHEAR FORCES WHILE TORSIONAL AND AXIAL LOADS WERE APPLIED. THE FLAPS ARE DRIVEN BY A SINGLE ELECTRIC MOTOR WHICH ROTATES TWO INDEPENDENT FLEXIBLE DRIVE SHAFTS THAT ACTUATE THE RIGHT AND LEFT FLAP PANELS. THE SHEARED PIN BROKE THE CONTINUITY OF THE LEFT FLAP PANEL DRIVE STOPPING THE FLAP PANEL WHILE THE RIGHT FLAP PANEL WOULD CONTINUE TO EXTEND OR RETRACT. THERE WAS NO SYSTEM OR MECHANISM IN THE AIRPLANE THAT DETECTED AN ASYMMETRICAL FLAP CONDITION. TESTS OF THE FLAP SYSTEM REVEALED THE ELECTRICAL MOTOR IN THE FLAP SYSTEM WAS CAPABLE OF SHEARING THE PIN BEFORE A CIRCUIT BREAKER WOULD INTERRUPT ELECTRICAL POWER TO THE MOTOR.
Probable Cause: a failure of the wing flap control system due to inadequate design, which led to an asymmetrical flap deployment during a critical flight condition and in-flight loss of control. A related factor was the lack of a split-flaps warning system.
Accident investigation:
 |
|
Sources:
NTSB LAX95LA278
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] |
| 09-Apr-2024 13:08 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Source, Narrative, Category, Accident report] |
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