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| Date: | Thursday 20 November 1986 |
| Time: | 11:12 |
| Type: |  Cessna U206F |
| Owner/operator: | Grangeville Air Service |
| Registration: | N7311Q |
| MSN: | U20602169 |
| Year of manufacture: | 1973 |
| Total airframe hrs: | 6547 hours |
| Engine model: | Continental IO-520-F |
| Fatalities: | Fatalities: 1 / Occupants: 2 |
| Other fatalities: | 0 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Moose Creek, ID -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | Moose Creek, ID (1U1) |
| Grangeville, ID (S80) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
AFTER DEPARTURE AND DURING THE INITIAL CRUISE CLIMB THE PLT AND PAX HEARD A METALLIC CLICKING DESCRIBED AS SOUNDING LIKE A 'VALVE TAP' IN AN AUTOMOBILE AND COMING FROM THE ENG AREA. THE PLT EXECUTED AN IMMEDIATE COURSE REVERSAL BACK TO THE AIRSTRIP WHILE STILL WITHIN THE NARROW GORGE OF THE SELWAY RIVER. THE IMMEDIACY OF THE REVERSE TURN WAS BROUGHT ABOUT BY THE PLT'S EXPECTATION OF IMPENDING MECH PROBLEM WITH THE ACFT AS WELL AS ANXIETY OF THE SITUATION AT SUCH A CRITICAL TIME DURING THE flight. THE TURN AT A RELATIVELY LOW ALT WITHIN THE GORGE NECESSITATED A TIGHT TURN RADIUS AND THUS REDUCED THE RATE OF CLIMB IN AN ALREADY HEAVILY LOADED ACFT. THIS EVENT PLACED THE ACFT IN A POSITION WHEREBY CLEARANCE WITH THE HEAVILY WOODED UPSLOPING SIDES OF THE GORGE WAS NOT POSSIBLE. DISASSEMBLY, INSPECTION AND TESTING (WHERE POSSIBLE) OF THE ENG, PROP AND ASSOCIATED COMPONENTS REVEALED NO EVIDENCE OF ANY PREIMPACT MALFUNCTION WHICH WOULD HAVE RESULTED IN A POWER LOSS, NOR ANY EXPLANATION FOR THE CLICKING NOISE. CAUSE:
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001213X35271
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:22 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency, ] |
Corrections or additions? ... Edit this accident description
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