ASN Wikibase Occurrence # 35583
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| Date: | Tuesday 11 December 1984 |
| Time: | 19:32 |
| Type: |  Piper PA-31-310 Navajo |
| Owner/operator: | Richards Aviation |
| Registration: | N9011Y |
| MSN: | 31-16 |
| Total airframe hrs: | 3979 hours |
| Engine model: | LYCOMING TI0-540-A1A |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Pontiac, Oakland County, Michigan -
 United States of America
|
| Phase: | En route |
| Nature: | Passenger - Non-Scheduled/charter/Air Taxi |
| Departure airport: | Bolivar, Tennessee (FAA LID: M08) |
| Oakland County International Airport, Pontiac, Michigan (PTK/KPTK) | |
| Confidence Rating: |  Information is only available from news, social media or unofficial sources |
THE AIRCRAFT DEPARTED THE AIRPORT WITH ONE DRY AIR PUMP INOPERATIVE AND THE OTHER PUMP READING LOW. AIRCRAFT CONTROL WAS LOST DURING AN INSTRUMENT APPROACH IN IMC APPROXIMATELY 2.5 HOURS LATER. BOTH PUMP DRIVE SHAFTS WERE FOUND SHEARED IN THE WRECKAGE AND BOTH BROKEN SHAFT SURFACES SHOWED POLISHED SURFACES.
DURING FURTHER TESTING IT WAS DISCOVERED THAT TAPE OR PIPE DOPE HAD BEEN USED IN THE THREADING OF THE INTAKE & OUTFLOW FITTINGS OF THE LEFT PUMP. NO CONTAMINANTS WERE FOUND IN THE RIGHT PUMP, BUT THE PUMP WALL INNER SURFACES GAP WAS APPROXIMATELY .005 IN. THIS GAP IS APPROX 50 PERCENT OVER THE ALLOWABLE TOLERANCE FOR A SERVICEABLE AIR PUMP.
THE PRESSURE REGULATOR VALVE TO THE ATTITUDE INDICATOR GYRO & THE COMPASS GYRO WERE EXAMINED & FOUND TO REQUIRE PRESSURE EXCEEDING NORMAL REQUIREMENT STANDARDS.
Sources:
1. NTSB Identification: CHI85FA070 at https://ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001214X41731&key=1
2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=9011Y
3. http://www.planecrashinfo.com/1984/1984-61.htm
4. http://planecrashmap.com/plane/mi/N9011Y/
5. [LINK NOT WORKING ANYMORE:http://www.baaa-acro.com/1984/archives/crash-of-a-piper-pa-31-navajo-chieftain-in-pontiac-2-killed/]
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 15-Jun-2015 20:13 | Dr. John Smith | Updated [Time, Aircraft type, Location, Nature, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:22 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 04-Oct-2017 14:16 | Dr. John Smith | Updated [Departure airport, Source, Narrative] |
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