ASN Wikibase Occurrence # 356569
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Tuesday 15 October 1996 |
| Time: | 03:00 LT |
| Type: |  Rockwell Aero Commander 690 |
| Owner/operator: | Sun West Aviation |
| Registration: | N15VZ |
| MSN: | 11035 |
| Year of manufacture: | 1972 |
| Engine model: | Garrett TPE-331-5 |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Phoenix, AZ -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Show Low, AZ (KSOW) |
| (KPHX) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that during flight, the nose gear dropped from the wheel well, he noted the hydraulic pressure had dropped to 600 psi, & the landing gear in-transit light illuminated. He said he accomplished emergency procedures, but was unable get the main landing gear to lock in the down position. The main landing gear collapsed during touchdown, & the belly of the airplane was damaged. The brake & landing gear systems were powered by 2 engine driven pumps (1 on each engine) & an auxillary (electrical) pump. For backup operation, gas pressure from an emergency nitrogen storage cylinder was continuously provided to a 2nd set of main gear actuators to provide pressure for main gear extension. During gear retraction, nitrogen was compressed back into the nitrogen cylinder. During extension, hydraulic pressure & nitrogen pressure work together to extend the main gear. After the accident, a hydraulic fluid leak was found at a hydraulic line fitting on the right main landing gear brake system, but no other leak was found. The leak was repaired, & the landing gear was functionally checked; the retraction & extension cycle functioned normally, & no system fault was found. No reason was found to explain why gas pressure from the emergency nitrogen storage cylinder did not lock the main gear in the down position.
Probable Cause: failure of the main landing gear to fully engage in the down-and-locked position for undetermined reason(s). Loss of hydraulic pressure to the main gear for undetermined reasons(s) was a related factor.
Accident investigation:
 |
|
Sources:
NTSB LAX97LA019
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 08:33 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation