Piper PA-31 N9111Y

Summary

On 6 August 1995 at about 17:50 local time, a Piper PA-31 registered N9111Y, operated by H & H Aviation, Inc., was involved in an accident near Boise, Idaho, United States. 2 people were on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

6 August 1995 at 17:50

Classification

Accident

Location

Boise, Idaho, United States

Coordinates

43.5607, -116.2095

Aircraft

Piper PA-31

Registration

N9111Y

Category

Airplane

Engines

2

Operator

H & H Aviation, Inc.

Operating rule

Part 91: General Aviation

Purpose of flight

Instructional

Phase of flight

Not recorded

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

SEA95LA177

Nobody was injured.

improper adjustment of the engine fuel control units by company maintenance personnel which led to excessive fuel flow and subsequent partial loss of engine power. Factors contributing to the accident were the rough terrain and high density altitude.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

After flying the airplane earlier in the day, the pilot-in-command (Chief Pilot} requested that the engines receive an adjustment for improved performance. The Director of Maintenance performed the adjustments by adjusting the fuel mixture control units on both engines. After the adjustment, the PIC and dual student departed for a Part 135 training flight. No problems were noted during the preflight inspection, engine start-up, taxi, engine run-up, and initial takeoff roll. During climbout, the airplane was unable to climb. The PIC stated that the right engine had a power problem due to the low manifold pressure and he feathered the right propeller to arrest the airplane's descent rate. The airplane continued to descend, and the dual student made the forced landing on rough terrain. Examination of the spark plugs revealed that the engines were operating with an excessively rich mixture. The density altitude was 5,560 feet. This was the dual student's first flight in a Piper PA-31.

Quoted verbatim from the NTSB record.