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Aviation safety reports, made easier to study

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May 21, 2008 · Eurocopter France AS350 B2 · N417AE

Hiram, GA

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
May 21, 2008
Injury Outcomes
No injuries (3 uninjured)
Location
Hiram, GA
Aircraft
Eurocopter France AS350 B2
Tail Number
N417AE
Operator
Omniflight Helicopters
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MIA08LA106

The pilot stated that after engine start, the helicopter shook violently as the throttle was advanced to flight rpm. He conducted an emergency shutdown, inspected the helicopter, and discovered that the tail rotor boom was buckled. Further inspection revealed that the main rotor starflex arm was broken. According to the director of maintenance, the starflex arm was overlooked during a conformity inspection. As a result, it was overflown by 586 hours. A review of a manufacturer service bulletin revealed that the service life on the starflex arm was 2,200 hours. At the time of the accident, the total time on the starflex arm was 2,786 hours. Due to the operator's record keeping process, the complex component life limit historical records were overlooked.

NTSB Probable Cause

The failure of the starflex arm during engine run-up due to inadequate inspection by maintenance personnel.

Full Narrative

On May 21, 2008, at 1004 eastern daylight time, a Eurocopter AS350 B2, N417AE, was substantially damaged during engine run-up, prior to takeoff at Caffery Heliport, Hiram, Georgia. The certificated commercial pilot and two passengers were not injured. Visual meteorological conditions prevailed and a company flight plan was filed for the positioning flight to Austell, Georgia. The helicopter was registered to GE Business Financial Services Incorporated, and operated by Omniflight under the provisions of Title 14 Code of Federal Regulations (CFR) Part 91. The pilot stated that after he conducted a preflight inspection, he started the helicopter. As he advanced the throttle from idle to flight rpm, the helicopter shook violently. He said that he immediately conducted an emergency shutdown and inspected the helicopter. During the inspection, he discovered that the tail rotor boom was buckled, and the main rotor starflex arm was broken. Based on information from the director of maintenance (DOM), the recent maintenance history and inspection status of the helicopter was reviewed. The review revealed that the starflex was not listed on the Aircraft Status Report for the accident aircraft. The DOM further stated that the record keeping process was prone to error, because interpretation of complex component life limit historical records were done by "lesser qualified personnel." An audit of the starflex's life limit status was conducted, and it was discovered that the life limit of 2,200 hours of the starflex had been exceeded by 586.4 operating hours. At the time of the accident, the total time on the starflex arm was 2,786 hours. When the accident aircraft was purchased, the starflex time in service was 2,588 hours. At that time, the operator's conformity inspection failed to discover the excess hours. After the accident the operator immediately audited the time in service of all the starflexes on the remainder of their fleet. No other starflexes were found to have exceeded their life limit.

Flight

Event TypeAccident
Event Time10:04 EDT
Nearest AirportCaffery Heliport (0nm)
Flight Plan FiledCvfr
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftEurocopter France AS350 B2
Tail NumberN417AE
Aircraft CategoryHeli
DamageSubstantial
OperatorOmniflight Helicopters
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsTurbomeca · Arriel 1D1 · Turboshaft · 732
Seats4

People & Injuries

Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 59 · Second Class · None

Conditions

ConditionsVMC
LightDaylight
Wind260° @ 15 kt, gusting 19 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point54
Altimeter29.76 inHg
Observation Time16:52
Weather SourceWFAC

Appendix: Source Data