ASN Wikibase Occurrence # 171444
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| Date: | Monday 17 November 2014 |
| Time: | 10:14 |
| Type: |  Piper PA-31-350 Navajo Chieftain |
| Owner/operator: | Gary Joseph Brawshaw |
| Registration: | VH-PWA |
| MSN: | 31-7652072 |
| Year of manufacture: | 1976 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Moorabbin Airport, VIC (MBW/YMMB) -
 Australia
|
| Phase: | Landing |
| Nature: | Cargo |
| Departure airport: | King Island, Currie, Tasmania (KNS/YKII) |
| Moorabbin Airport, VIC (MBW/YMMB) | |
| Investigating agency: | ATSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Substantially damaged due to an undercarriage malfunction on landing at Moorabbin (Harry Hawker) Airport, Melbourne, Victoria. According to the final ATSB accident report:
"When the gear was selected down only the left main gear gave a down indication. The pilot carried out emergency extension procedures which resulted in a down indication for the right main gear. During the subsequent landing with the nose landing gear trailing, the lower fuselage and propellers were abraded. Investigation disclosed that the hydraulic system had lost its oil overboard through the right engine hydraulic pump case drain.
This occurred because the left engine driven hydraulic pump main shaft seals had been incorrectly assembled.
The two seals are required to be placed back to back on the shaft, with one cup facing into the pump body and one facing away from the body. The seals had been placed with both cups facing away from the pump body. This allowed the pump to force oil past the inner seal instead of the pressure acting to positively seat the seal onto the shaft. The pump was newly overhauled having been fitted to the engine on the day prior to the accident. It had completed one flight of 1.7 hours duration.
Although the hydraulic reservoir contains an emergency oil supply, it is suspected that foaming of the contents due to pump cavitation precluded successful extension of all landing gears.
Significant factors
1. The seals on the main shaft of the right engine driven hydraulic pump were incorrectly installed.
2. The hydraulic oil was pumped overboard past the incorrectly installed seals.
3. The emergency oil supply was not able to successfully extend all three landing gears.
4. During the landing roll the nose landing gear collapsed."
Accident investigation:
 |
|
Sources:
1. ATSB Final Report: https://www.atsb.gov.au/media/5227173/199301050.pdf
2. http://www.news.com.au/video/id-l0b3NxcTpRzplHCISfduY-Gyo09_og9a/Melbourne-plane-makes-emergency-landing
3. https://www.jetphotos.com/photo/8430725
4. http://www.regosearch.com/aircraft/au/PWA
History of this aircraft
Other occurrences involving this aircraft
| 5 February 1993 | VH-PWA | unknown | 0 | Moorabbin Airport (YMMB), Moorabbin, VIC | |
sub |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Nov-2014 07:00 | Petropavlovsk | Added |
| 20-Nov-2014 07:00 | harro | Updated [Aircraft type, Operator, Total fatalities, Other fatalities] |
| 07-Sep-2017 13:47 | Dr. John Smith | Updated [Time, Location, Departure airport, Destination airport, Source, Damage, Narrative] |
| 22-Oct-2017 21:04 | Dr. John Smith | Updated [Aircraft type, Operator, Source] |
| 09-Jun-2022 20:46 | Ron Averes | Updated [Location] |
Corrections or additions? ... Edit this accident description
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