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ASN Wikibase Occurrence # 174397
Last updated: 27 November 2021
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Type:Silhouette image of generic PA27 model; specific model in this crash may look slightly different
Piper PA-23-250 Aztec
Owner/operator:Pesquera Rafael A
Registration: N1153P
MSN: 23-166
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Condado Lagoon, San Jaun -   Puerto Rico
Phase: Initial climb
Departure airport:San Juan, PR (SIG)
Destination airport:St. Thomas, VI (STT)
Investigating agency: NTSB
According to the commercial pilot, before departing for the personal flight, he had the airplane fueled with a total of 50 gallons of 100LL aviation fuel (25 gallons of fuel in each wing tank). He then performed an engine run-up and noted that all parameters were “normal.” After the airplane became airborne, it obtained a positive climb rate of 500 ft per minute. When the airplane reached about 300 ft above ground level, the right engine experienced a total loss of power. The pilot subsequently feathered the propeller but noticed that the airplane was unable to maintain altitude, so he performed an emergency landing to a lagoon.
A postaccident examination of the right engine confirmed crankshaft continuity; however, two of the four cylinders exhibited low compression ratios. The right engine-driven fuel pump, carburetor, and fuel selector were disassembled and examined, and corrosion was noted in all of the components. It could not be determined if the corrosion was a result of the airplane being submerged in salt water after the accident or if it was present before the accident. Wreckage examination and component testing did not reveal a mechanical reason for the partial power loss. The reported weather conditions were conducive to serious carburetor icing at glide power; however, the engine was operating at a high power setting for takeoff; therefore, it is unlikely that carburetor ice caused the total loss of engine power.

Probable Cause: The total loss of right engine power for reasons that could not be determined because postaccident examination of the airframe and engine did not reveal any anomalies that would have precluded normal operation.



Revision history:

10-Mar-2015 04:31 Geno Added
10-Mar-2015 16:48 Geno Updated [Registration, Cn, Operator, Source, Narrative]
08-Apr-2015 16:51 Geno Updated [Time, Nature, Source, Damage, Narrative]
08-Apr-2015 17:18 Anon. Updated [Time, Aircraft type]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
01-Dec-2017 12:47 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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