# NTSB ANC94IA020: Swearingen SA227, N630PA, King Salmon, AK, November 30, 1993 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: November 30, 1993, 18:58 local (22:58 UTC) - Place: King Salmon, AK - Coordinates: 58.750202, -156.540237 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=58.7502&lon=-156.5402&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 11 uninjured - Status: Completed, report September 26, 1994 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 2455 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC94IA020 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/2455/pdf - Page: https://openairdocs.org/ntsb/ANC94IA020 ## Probable cause THE PILOT-IN-COMMAND DID NOT MAINTAIN CONTROL OF THE AIRPLANE AND DID NOT PERFORM THE APPROPRIATE PROCEDURES FOR AN ABORTED TAKEOFF. A FACTOR IN THE INCIDENT WAS THE ASYMMETRY IN POWER BETWEEN THE PLANE'S TWO ENGINES FOR UNDETERMINED REASONS. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - On ground/water collision with object, takeoff - aborted - powerplant - undetermined (contributing factor) - aircraft control - not maintained, pilot in command (cause) - procedures/directives - not performed, pilot in command (cause) ## Analysis THE AIRPLANE BEGAN TO DIVERGE TO THE RIGHT OF THE RUNWAY CENTERLINE DURING THE INITIAL TAKEOFF RUN AT A GROUND SPEED OF BETWEEN 20 AND 30 KNOTS. THE PILOT-IN-COMMAND (PIC) GLANCED AT THE ENGINE INSTRUMENTS AND OBSERVED AN ASYMMETRY IN TORQUE BETWEEN THE PLANE'S TWO ENGINES. THE PIC REPORTED THAT IN HIS HASTE TO ACCOMPLISH THE ABORT, HE WAS NOT ABLE TO GET THE LEFT POWER LEVER BACK TO THE GROUND IDLE POSITION PRIOR TO THE IMPACT WITH THE NORTHWEST ARRESTING BARRIER PIT. THE PIC SAID THAT HE DEPRESSED THE NOSE WHEEL STEERING BUTTON BUT DID NOT PUSH THE BUTTON ON THE ENGINE POWER LEVER TO ENGAGE THE NOSE WHEEL STEERING. THE REASON FOR THE DELAYED OR DECREASED TORQUE FROM THE NO. 2 ENGINE COULD NOT BE CONCLUSIVELY DETERMINED. ## Factual narrative On November 30, 1993, at 1858 Alaska standard time, a wheel equipped Fairchild (formerly Swearingen) SA227 Metroliner airplane, N630PA, registered to and operated by Peninsula Airways Inc. dba PENAIR, flight 4028, ran off the south side of runway 11 at the King Salmon Airport, King Salmon, Alaska during an aborted takeoff. The airline transport certificated pilot-in-command and first officer (both captains) and the nine revenue passengers were not injured. The airplane sustained minor damage. The 14 CFR Part 135 scheduled commuter flight originated at King Salmon and the intended destination was Anchorage, Alaska. Visual meteorological conditions prevailed and an instrument flight plan was in effect. Telephone interviews were conducted with the captain and first officer by the NTSB investigator-in-charge. The captain reported that he aligned the airplane with the runway centerline using the plane's nose wheel steering, then, per the PENAIR airplane checklist, he disconnected the nose wheel steering. The captain said that he called for speeds high (96% to 97%) on both power levers. The first officer said that in order to prevent any adverse yaw during the initial stages of the takeoff run, he adjusted the power levers, advancing the left engine throttle ahead of the right by approximately 1 inch because the left engine was historically slower to respond. The captain said that the power from the right engine stopped advancing, "perhaps" halfway into the throttle run, and the plane began diverging to the right. The captain said that he glanced at the engine instruments and observed, albeit, to an unknown degree, an asymmetry in torque between the No.1 and 2 engines. The plane's ground speed at the time was between 20 and 30 knots. The captain said that he immediately attempted to bring both engine power levers back to their flight idle stops then up and over the gate to the ground idle position. The captain said that in his haste to accomplish the abort, he was not able to get the left power lever back to ground idle before the impact. The captain said that he attempted to keep the airplane on the runway with differential braking but was not successful. The plane's nose landing wheel collided with the northwest arresting barrier pit resulting in extensive damage to the nose gear assembly. Both crewmembers said that during the rejected takeoff (RTO) sequence no verbal communication transpired between them and that at the time of the RTO, the surface condition of the runway, for the most part, was clear and dry. The director of airport operations for the King Salmon Airport examined the area of the incident shortly after it occurred. The director reported that the airplane did not leave heavy rubber reversion deposits on the surface of the runway. The results of the toxicological examinations conducted on the flightcrew were negative. ## Aircraft - Registration: N630PA (not matched to a registry record) - Reported make and model: SWEARINGEN SA227 - Category: Airplane - Serial number: AC463 - Airframe hours: 22287 - Engines: GARRETT TPE331-11 1100 horsepower turbo prop - Damage: Minor damage - Flight: Part 135 - Registered owner: Penair - Airworthiness certificate: Standard, Normal - Last inspection: Continuous airworthiness, November 18, 1993, 59 hours before - Destination: ANC, ANCHORAGE, AK - Flight plan: IFR - Airport: AKN, King Salmon, runway 11, 8,500 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 41; flight instructor, airline transport, flight engineer; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; toxicology performed; flight hours: 9,015 total, 3,762 in this make and model, 3,295 as pilot in command, 387 in the last 90 days, 101 in the last 30 days, 7 in the last 24 hours ## Weather - Conditions: Visual (VMC), Night/dark - Wind: 70° at 7 knots - Visibility: 20 statute miles - Lowest ceiling: none - Temperature: 36 °F, dew point 28 °F - Altimeter: 28.00 inHg ## 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 19931130045219I](https://openairdocs.org/incident/19931130045219I), Nov 30, 1993: Swrngn SA226AC, King Salmon, AK, Minor damage. Pilot lost control on rollout. Veered off runway. Pilot unable to get left propeller in reverse. 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.