Accident Cirrus SR22 GTS N234PJ, 28 Oct 2016
ASN logo
ASN Wikibase Occurrence # 190978
 
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

Date:28-OCT-2016
Time:09:54
Type:Silhouette image of generic SR22 model; specific model in this crash may look slightly different    
Cirrus SR22 GTS
Owner/operator:Private
Registration: N234PJ
MSN: 1729
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:San Juan County, Bloomfield, NM -   United States of America
Phase: En route
Nature:Private
Departure airport:Albuquerque, NM (ABQ)
Destination airport:Pagosa Springs, CO (PSO)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
The private pilot was conducting a cross-country personal flight. He reported that, during cruise flight, the engine starting "missing" and that, within 2 minutes, lost all power. His attempts to restore engine power were not successful. He was unable to locate a suitable forced landing site within the airplane’s glide range, so he chose to activate the ballistic parachute system. The aft fuselage separated from the airframe during the accident sequence. The airplane came to rest in an area of low brush and small trees.

Postaccident engine examination revealed that the fuel port cap was not installed on the throttle body metering unit. The cap was subsequently found in the cylinder baffling immediately below the metering unit. Both the fitting and the cap appeared to be undamaged. The cap was subsequently reinstalled, and an engine test run was conducted with no anomalies noted.

Data downloaded from the airplane’s onboard avionics indicated that the engine speed and fuel flow were stable for the initial portion of the flight. However, about 45 minutes into the flight, the engine speed and fuel flow decayed abruptly, and the airplane entered a gradual descent. The engine speed did not recover during the rest of the flight. Before the loss of engine power, the fuel flow initially decreased from about 18.0 gallons per hour (gph) to 9.9 gph, before increasing to about 30.0 gph after the loss of power.
Examination of the fuel system revealed that the fuel flow transducer was installed between the fuel pump/mixture control and the throttle body metering unit, which was upstream in the fuel flow relative to the fuel port fitting. The loss of the fuel port cap would have allowed unrestricted fuel flow into the engine compartment. The transducer would have continued to measure fuel flow passing through the unit even though that fuel was ultimately not reaching the engine because it was installed upstream to the fuel port fitting. Further, the increased fuel flow measured after the loss of engine speed was consistent with an availability of fuel, a functioning fuel pump, and the mixture control being at or near the full-rich position.

Maintenance records revealed that, about 3 weeks before the accident, the engine’s fuel nozzles were replaced, followed by an operational flight check and a ground run, to verify that the fuel system setting was in accordance with the Engine Maintenance and Overhaul Manual. The manual specified that the fuel port cap needed to be removed to connect external fuel pressure gauges and then reinstalled once testing and necessary fuel system adjustments were completed. The airplane had been operated 9.2 hours since the fuel nozzles were installed.

Based on the available information, it is likely that maintenance personnel did not fully torque the fuel port cap before the airplane was returned to service, which allowed the cap to loosen due to engine vibration during normal operation and then back off. At that point, the fuel supply to the engine would have been interrupted, and the engine would have lost all power due to fuel starvation. Restoring fuel flow to the engine in-flight in this situation would not have been possible.



Probable Cause: Maintenance personnel’s failure to fully torque the fuel port cap, which allowed the cap to back off in flight and interrupted fuel flow to the engine, which resulted in a total loss of engine power.

Sources:

NTSB

https://flightaware.com/live/flight/N234PJ

FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=234PJ

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 3 years
Download report: Final report
Location


Revision history:

Date/timeContributorUpdates
29-Oct-2016 03:44 Geno Added
07-Nov-2016 15:29 Geno Updated [Time, Nature, Departure airport, Source, Damage, Narrative]
12-Nov-2016 12:19 RobertMB Updated [Aircraft type, Narrative]
10-Nov-2019 14:32 ASN Update Bot Updated [Time, Operator, Country, Departure airport, Destination airport, Source, Narrative, Accident report, ]

Corrections or additions? ... Edit this accident description

The Aviation Safety Network is an exclusive service provided by:
Quick Links:

CONNECT WITH US: FSF Facebook FSF Twitter FSF Youtube FSF LinkedIn FSF Instagram

©2023 Flight Safety Foundation

701 N. Fairfax St., Ste. 250
Alexandria, Virginia 22314
www.FlightSafety.org