ASN Wikibase Occurrence # 371928
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: | Wednesday 4 November 1987 |
| Time: | 19:00 LT |
| Type: |  Learjet 35A |
| Owner/operator: | Jack Eckerd Corp. |
| Registration: | N900JE |
| MSN: | 123 |
| Total airframe hrs: | 5642 hours |
| Engine model: | GARRETT TFE-731-2-2B |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Clearwater, FL -
 United States of America
|
| Phase: | Taxi |
| Nature: | Executive |
| Departure airport: | W. Palm Bch, FL (KPBI) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING TAXI UP TO HANGAR UNDER DIRECTION OF LINEMAN AFTER ARRIVAL THE FLT EXPERIENCED LOSS OF HYDRAULIC PRESSURE AND BRAKES. THE PLT COULD NOT ACTIVATE THE EMERGENCY BRAKES PRIOR TO ROLLING INTO THE HANGAR AND COLLIDING WITH TWO ACFT PRIOR TO COMING TO REST. EXAMINATION OF THE ACFT REVEALED THE SPOILERON CONTROL VALVE ASSEMBLY SUFFERED FRACTURE OF A NAS1351-4H-24P SCREW DUE TO HYDROGEN EMBRITTLEMENT CRACKING WHICH CAUSED THE SCREW HEAD TO SEPARATE FROM THE SCREW SHANK. THE SCREW IS ONE OF THREE WHICH RETAINS THE SELECTOR VALVE TO THE MANIFOLD ASSEMBLY. WHEN THE SCREW FAILED THE VALVE BODY SEPARATED ALLOWING LOSS OF ALL USABLE HYDRAULIC FLUID. THE SOURCE OF THE MIGRATING ELEMENTAL HYDROGEN INTO THE FRACTURE AREA COULD NOT BE DETERMINED. THE VALVE ASSEMBLY HAD BEEN INSTALLED IN THE ACFT SINCE MANUFACTURE IN 1977 AND HAD ACCUMULATED 5,642 HOURS. THE VALVE IS MAINTAINED ON CONDITION.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB MIA88LA027
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Mar-2024 11:42 | 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