ASN Wikibase Occurrence # 352395
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| Date: | Thursday 28 October 1999 |
| Time: | 18:41 LT |
| Type: | Loral GZ-22 |
| Owner/operator: | The Goodyear Tire & Rubber Co |
| Registration: | N4A |
| MSN: | 4120 |
| Total airframe hrs: | 12632 hours |
| Engine model: | Allison 250-B17C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mogadore, OH -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | (4OH6) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot of the fly-by-wire airship flew several traffic patterns and approaches from both the pilot and co-pilot stations. After he departed the traffic pattern and leveled the airship, it entered an uncommanded, descending left-hand turn. The control panel displayed no indication of a malfunction, and emergency and troubleshooting procedures failed to regain control of the airship. The airship landed in trees, and both the pilot and the technician on board escaped injury. Metallurgical examination of the actuators that convert electrical signals to mechanical flight control inputs revealed that the splined shafts on the output side of the starboard actuator were almost completely stripped, and provided no flight control input. The gear teeth of the splined shafts on the output side of the port actuator were worn to 25 percent of their original thickness, and did not provide full flight control input. Hardness testing revealed the output shafts of both the port and starboard actuators did not meet the manufacturer's specified hardness requirement. The manager of the airship fleet said the one-of-a-kind airship would not be rebuilt.
Probable Cause: The failure of the flight control system manufacturer to meet design (hardness) specifications that resulted in stripped splines.
Accident investigation:
 |
|
Sources:
NTSB IAD00LA002
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Mar-2024 13:33 | ASN Update Bot | Added |
| 07-Mar-2024 13:35 | ASN | Updated [Aircraft type, Narrative, Plane category] |
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