NONE · de Havilland DHC-8-102 · 2001-03-06 · Portland, OR, USA
Event
NTSB number
SEA01FA059
Event ID
20010308X00571
Type
Accident
Date
2001-03-06
Location
Portland, OR, USA
Coordinates
45.569744, -122.589462
Injuries
Highest injury
NONE
Fatal
0
Serious
0
Minor
0
Uninjured
33
Total aboard
33
Aircraft
Make
de Havilland
Model
DHC-8-102
Registration
N822PH
FAR Part
121
Engines
2
Damage
SUBS
Conditions
Light
DAYL
Weather
VMC
Probable cause
The failure of the number 5 engine bearing assembly followed by the disconnection of the P2.5/P3 switching valve to rear inlet case sealing air tube and the melting of the NL probe port (sealing tube) which allowed an oil fed fire beyond the constraints of the engine casing and into the engine nacelle. A contributing factor was the company's failure to follow several maintenance procedures within the maintenance manual after a previous oil loss event. A second factor was the omission of the PW120A engine from the airworthiness directive issued by the FAA which mandated the completion of Pratt & Whitney service bulletin 20914. The lack of inclusion of the PW120A engine in the AD resulted in the company’s correct interpretation that the service bulletin was not mandatory.