ASN Wikibase Occurrence # 366146
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| Date: | Sunday 23 September 1990 |
| Time: | 10:46 LT |
| Type: |  Piper PA-30 |
| Owner/operator: | Wendall & Jean Durr |
| Registration: | N752CF |
| MSN: | 30-592 |
| Year of manufacture: | 1964 |
| Total airframe hrs: | 4246 hours |
| Engine model: | LYCOMING IO-320-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Cape Girardeau, MO -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | Alton, IL (KALN) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT STATES HE OBTAINED NO GEAR MOVEMENT ON SELECTING GEAR DOWN. WHEN THE SWITCH WAS RECYCLED, THE LANDING GEAR EXTENDED BUT THE GEAR DOWN INDICATOR DID NOT ILLUMINATE. TOWER REPORTED THE GEAR APPEARED TO BE DOWN. THE PILOT THEN USED MANUAL EXTENSION TO LOWER THE GEAR AND REPORTS HE OBTAINED A DOWN LOCKED LIGHT. THE LANDING GEAR RETRACTED DURING LANDING ROLLOUT. EXAMINATION REVEALED EXCESSIVE PLAY IN THE LEFT AND RIGHT MAIN GEAR LINKAGE. THE LEFT MAIN GEAR EXTENDED BUT WOULD NOT ACHIEVE OVER-CENTER IN THE DOWN POSITION USING MANUAL EXTENSION. A WIRE TO THE LEFT GEAR DOWN SWITCH WAS BROKEN WITHIN ITS INSULATION; IN AN AREA WHERE THE WIRE FLEXES AS THE GEAR CYCLES. LATER PRODUCTION AIRPLANES INCLUDE A LANDING GEAR DOWN SAFETY DEVICE TO MECHANICALLY LOCK THE GEAR DOWN WHEN EXTENDED MANUALLY. THE DEVICE MAY BE FITTED TO EARLIER AIRPLANES, AND ITS AVAILABILITY WAS ANNOUNCED IN 1973 IN A SERVICE SPARES LETTER.
Probable Cause: EXCESSIVE PLAY IN THE LANDING GEAR EXTENSION LINKAGE. A FACTOR IN THE INCIDENT WAS UNRELIABILITY OF THE GEAR INDICATING SYSTEM.
Accident investigation:
 |
|
Sources:
NTSB CHI90GA273
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Mar-2024 17:53 | ASN Update Bot | Added |
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