# NTSB ATL91IA050: Piper PA-60-600, N6070D, Cochran, GA, February 5, 1991 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: February 5, 1991, 02:10 local (07:10 UTC) - Place: Cochran, GA - Coordinates: 32.380657, -83.35054 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=32.3807&lon=-83.3505&mi=10 - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report May 5, 1993 - Report: Approved by Office Director - NTSB case key (mKey): 8344 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ATL91IA050 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/8344/pdf - Page: https://openairdocs.org/ntsb/ATL91IA050 ## Probable cause FAILURE OF THE RIGHT ENGINE SHUTOFF VALVE WHICH RESULTED IN A COMPLETE LOSS OF ENGINE POWER. THE AIRPLANE VEERED OFF THE RIGHT SIDE OF THE RUNWAY AND THE RIGHT MAIN LANDING GEAR COLLAPSED AS A RESULT OF THE PILOTS FAILURE TO MAINTAIN DIRECTIONAL CONTROL DURING THE LANDING ROLLOUT. FACTORS IN THIS INCIDENT WERE THE DARK NIGHT, AND A LOSS OF HYDRAULIC PRESSURE WHEN THE RIGHT ENGINE FAILED. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(partial) - mech failure/malf - fuel system,fuel shutoff - failure,total (cause) - hydraulic system - pressure too low (contributing factor) - 1 engine - Loss of control - on ground/water, landing - roll - precautionary landing - not used, pilot in command - directional control - not maintained, pilot in command (cause) - light condition - dark night (contributing factor) - Main gear collapsed, landing - roll - landing gear - overload ## Analysis WHILE CRUISING AT 7000 FEET THE PILOT EXPERIENCED A LOSS OF POWER ON THE RIGHT ENGINE. THE PILOT REQUESTED ASSISTANCE FROM JACKSONVILLE CENTER, AND WAS VECTORED TO COCHRAN AIRPORT. THE PILOT ESTABLISHED AN APPROACH TO THE AIRPORT BUT WAS UNABLE TO LOWER THE WING FLAPS. APPARENTLY, AFTER THE LANDING GEAR WAS EXTENDED, THERE WAS NOT ENOUGH HYDRAULIC PRESSURE AVAILABLE TO LOWER THE WING FLAPS. THE ONLY HYDRAULIC PUMP WAS INSTALLED ON THE RIGHT ENGINE. THE PILOT LOST DIRECTIONAL CONTROL DURING THE LANDING ROLLOUT, AND THE AIRPLANE VEERED OFF THE RIGHT SIDE OF THE RUNWAY INTO A DITCH. THE PILOT STATED THAT HEAVY LEFT BRAKING WAS USED, BUT FAILED TO CORRECT THE RIGHTWARD DRIFT. ACCORDING TO THE FLIGHT MANUAL, THE PILOT SHOULD USE ENGINE POWER AND BRAKING TO MAINTAIN DIRECTIONAL CONTROL DURING THE EMERGENCY LANDING. EXAMINATION OF THE AIRPLANE DISCLOSED THAT THE RIGHT FUEL SHUTOFF VALVE HAD FAILED AND FUEL WAS SHUTOFF TO THE RIGHT ENGINE. ADDITIONALLY, THE RIGHT WING SPAR WAS REPAIRED PRIOR TO RESTORING THE AIRPLANE TO A FULL AIRWORTHY STATUS. ## Aircraft - Registration: [N6070D](https://openairdocs.org/deregistered/N6070D-2011-04-05), registration cancelled 2011-04-05, S/N 6006797961214, built 1979 (OpenAirDocs) - Reported make and model: PIPER PA-60-600 - Registry model: [Piper AEROSTAR 600](https://openairdocs.org/model/piper-aerostar-600) (registry code 7106001) (OpenAirDocs) - Registry engine: [Lycoming TI0-540 series](https://openairdocs.org/engine/lycoming-ti0-540-series) (registry code 41533, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: 600677961214 - Engines: LYCOMING IO-540-S1A5 290 horsepower reciprocating - Damage: Minor damage - Fire: Unknown - Flight: Part 135 - Operator: Top Flight Inc. - Departed: ATL, ATLANTA, GA - Destination: TPA, TAMPA, FL - Flight plan: IFR - Airport: 48A, Cochran, runway 5, 3,200 × 50 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 32; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; flight hours: 3,326 total, 300 in this make and model, 3,275 as pilot in command, 100 in the last 90 days, 2 in the last 24 hours ## Weather - Conditions: Visual (VMC), Night/dark - Wind: calm - Visibility: 15 statute miles - Lowest ceiling: 25,000 ft overcast - Temperature: -0 °F, dew point -0 °F - Observed at: MCN, 20 nm away ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Incident 19910205004109I](https://openairdocs.org/incident/19910205004109I), Feb 5, 1991: Piper PA60600, Cochran, GA. Right engine problem. Secured engine and landed. Lost directional control and veered off runway. Gear collapsed. ## Other investigations on N6070D (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB ATL84FKG02](https://openairdocs.org/ntsb/ATL84FKG02), Feb 16, 1984: Piper PA-60 (N6070D), Atlanta, GA, substantial damage From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.