Accident Cirrus SR22 N422PB, 07 Jul 2015
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ASN Wikibase Occurrence # 177649
 
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Date:07-JUL-2015
Time:11:37
Type:Silhouette image of generic SR22 model; specific model in this crash may look slightly different    
Cirrus SR22
Owner/operator:Airccs LLC
Registration: N422PB
MSN: 2379
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Near George Bush Intercontinental/Houston Airport (KIAH), Houston, TX -   United States of America
Phase: Initial climb
Nature:Executive
Departure airport:Houston, TX (KIAH)
Destination airport:Austin, TX (KAUS)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
Before the accident flight, maintenance personnel removed the airplane's propeller governor, checked it for proper operation, and reinstalled it on the engine. The airline transport pilot and passenger departed on the business flight. The pilot reported that, during initial climb, he noticed increasing engine temperature, so he reduced engine power to lower the engine temperature. When the airplane was about 900 ft above ground level, the engine lost partial power and, shortly thereafter, lost total power. With no suitable forced landing area, the airframe ballistic parachute system was deployed, and the airplane impacted terrain next to a residence and sustained substantial damage.

Postaccident examination of the engine found that the propeller governor drive gear was fractured, and the gear teeth exhibited damage consistent with the governor drive gear being misaligned. A bench test performed on the governor revealed that it operated within the specified parameters for the unit. The examination also noted the governor washers were improperly stacked; however, this likely did not contribute to the engine failure.

A review of engine performance data for the accident flight revealed that the engine rpm reached at least 3,500 rpm during initial climb, which is 800 rpm over the maximum engine speed; it is likely this overspeed condition occurred as a result of the governor drive gear fracturing. The governor drive gear was likely damaged during the installation of the propeller governor, which subsequently failed during takeoff and allowed the engine to overspeed and overheat to the point of losing power.

Probable Cause: Maintenance personnel's improper installation of the propeller governor, which resulted in damage to the governor drive gear and its subsequent failure and a subsequent loss of engine power.

Sources:

NTSB
https://flightaware.com/live/flight/N422PB/history/20150707/1633Z/KIAH/KAUS

FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=422PB

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 4 years
Download report: Final report
Location


Images:


Revision history:

Date/timeContributorUpdates
07-Jul-2015 19:15 Geno Added
08-Jul-2015 06:57 Anon. Updated [Photo, ]
16-Jul-2015 02:20 Geno Updated [Time, Nature, Source, Damage, Narrative]
21-Dec-2016 19:30 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
06-Jul-2019 19:34 ASN Update Bot Updated [Operator, Departure airport, Destination airport, Source, Narrative, Accident report, ]
06-Jul-2019 20:13 harro Updated [Operator, Departure airport, Destination airport, Source, Narrative]

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