GAA17CA570

NTSB accident investigation · Piper PA 31 · Saipan · August 30, 2017

Accident · No injuriesData collectionFinal report
Date
August 30, 2017
Place
Saipan
Injuries
7 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N4078JPiper PA 31
Defining event
Takeoff: Birdstrike
Weather
Visual (VMC) · Day
Status
Completed · report April 23, 2018
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
FAA report
20170830014039A
Case key
96145

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

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.

Findings · 2

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Object/animal/substance: animal(s)/bird(s)Environmental issues › Physical environment · Effect on equipmentPiper PA-31-350: 5 casesAll aircraft: 358 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

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.

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.

Aircraft

Registration
N4078J
Reported as
Piper PA 31 (350)
Category
Airplane
Serial number
31-8152057
Built
1980
Airframe hours
9,341.1
Engines
Lycoming TIO-540-J2BD, 350 horsepower, reciprocatingLycoming TIO-540-J2BD, 350 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 135
Operator
Star Marianas Air, Inc.
Registered owner
Marianas Transportation Management Solut
Airworthiness certificate
Standard, Normal
Last inspection
Continuous airworthiness · August 2, 2017
Departed
GRO · Rota Island
Destination
GSN · Saipan
Flight plan
IFR
Airport
GSN · Francisco C Ada/Saipan Intl, runway 24, 7,001 × 100 ft, asphalt
Equipment
Stall warning system, Auto-pilot

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
43
Injuries
None
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
April 18, 2017
Seat
Left
Restraint
3-point
Flight hours
5,847 total · 2,005 in this make and model · 5,714 as pilot in command · 186 in the last 90 days · 128 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
200° at 6 knots
Visibility
10 statute miles
Lowest ceiling
11,000 ft broken
Temperature
81 °F, dew point 75 °F
Altimeter
29.79 inHg
Observed at
PGSF

Docket · 3

The files NTSB released with the investigation on March 12, 2018, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.2 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.