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GAA17CA570

2017-08-30 · Saipan, United States · None · 1 aircraft · Status: Completed

Airport GSN

Current FAA registration · N4078J

Make / Model
PIPER PA-31-350
Year of manufacture
1980 · 37 years old at event
Engine
LYCOMING TI0-540 SER (310 hp)
Seats / Engines
8 seats · 2 engines
Last airworthiness date
19810126
ADS-B equipped
Yes — Mode-S A4CA1B

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

Impact with multiple birds while retracting the landing gear, which resulted in the subsequent failure of the right inboard main landing gear door actuator hose and prevented the pilot from being able to extend the landing gear.

Factual narrative

The pilot reported that during the initial climb, about 150 feet above the ground, while the landing gear was being retracted, the airplane impacted a flock of medium sized birds. He noted that the landing gear unlock indicator remained illuminated and the landing gear handle would not return to the up neutral position. No degradation of performance was noted, so the pilot choose to continue to his destination. About 20 miles from the airport, the pilot attempted to lower the landing gear, but was unsuccessful. He contacted maintenance personnel on the ground and advised them of the landing gear issue. The ground maintenance personnel visually verified that the nose and right main landing gear were down. The pilot performed the emergency gear extension checklist and noted little to no resistance on the hand pump. After multiple attempts to lower the landing gear, Airport Rescue and Fire Fighting Support was requested. Soon after, the pilot received clearance to land. During the landing the right main landing gear collapsed and the left wing impacted the ground. The airplane sustained substantial damage to the fuselage. A postaccident examination revealed snarge on both horizonal stabilizers, left wing, and fuselage. It was noted that the right inboard main landing gear door actuator hose had failed. The pilot reported that, during the initial climb, about 150 ft above the ground, while the landing gear were being retracted, the airplane impacted a flock of medium-sized birds. He noted that the landing gear unlock indicator remained illuminated and that the landing gear handle would not return to the up neutral position. No degradation of performance was noted, so the pilot chose to continue to his destination. About 20 miles from the airport, the pilot attempted to lower the landing gear but was unsuccessful. He contacted maintenance personnel on the ground and advised them of the landing gear issue. The ground maintenance personnel visually verified that the nose and right main landing gear (MLG) were down. The pilot performed the emergency gear extension checklist and noted little to no resistance on the hand pump. The pilot made multiple attempts to lower the landing gear without success. During the landing, the right MLG collapsed, and the left wing impacted the ground. The airplane sustained substantial damage to the fuselage. Postaccident examination revealed snarge on both horizonal stabilizers, the left wing, and the fuselage and that the right inboard MLG door actuator hose had failed. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

FAA avdata. C = Cause, F = Factor.

  • C Environmental issues-Physical environment-Object/animal/substance-Animal(s)/bird(s)-Effect on equipment - C
  • C Aircraft-Aircraft systems-Hydraulic power system-Hydraulic, main system-Failure - C

Verbatim from NTSB's published report. Source file NTSB_2017_GAA17CA570.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

Related research

Matched on aircraft type or causal vocabulary (maintenance). All research papers