Flybe DH8D at Manchester on May 26th 2017, engine shut down in flight

Last Update: April 12, 2018 / 15:00:01 GMT/Zulu time

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Incident Facts

Date of incident
May 26, 2017

Classification
Incident

Airline
Flybe

Flight number
BE-292

Aircraft Registration
G-PRPH

ICAO Type Designator
DH8D

A Flybe de Havilland Dash 8-400, registration G-PRPH performing flight BE-292 from Edinburgh,SC to Manchester,EN (UK) with 53 passengers and 4 crew, was descending through 8000 feet on approach to Manchester when the crew needed to shut the right hand engine (PW150) down. The aircraft continued for a safe landing on Manchester's runway 23R about 15 minutes later.

The airline reported the crew shut the #2 engine down as a precaution.

On Apr 12th 2018 the AAIB released their Bulletin concluding the probable cause of the serious incident was:

The loss of oil pressure on the No 2 engine was because a cap locating the propeller overspeed governor test solenoid had detached due to failure of the attachment bolts, predominantly in fatigue. The cause of the bolt group fatigue failure was not established, but the possibility that a lower than specified assembly torque tightening figure was used on one or more bolts during assembly could not be ruled out.

The AAIB described the history of the flight:

The commander reported that, whilst descending through FL120, the warning system emitted a ‘triple chime’ with a red Central Warning System indication of No 2 engine oil pressure low. He checked the engine display and noted an indicated oil pressure of 17 psi, which was decreasing. He reduced power, although being in the descent the engine was already operating at close to the flight idle setting. As the oil pressure continued to drop, he elected to shut down the No 2 engine, taking over the flying of the aircraft from the co-pilot before doing so. The flight crew carried out the Vital Actions and ran through the QRH. The commander communicated with the cabin crew, carried out a ‘NITS1’ brief, informed ATC and obtained the destination weather. He then addressed the passengers. A normal landing was carried out following radar vectoring to the ILS.

The AAIB reported within the overspeed governor examination:

Examination of the wire locking that both secured the bolt heads and joined them in pairs indicated that, though not in conflict with the production drawings, the orientation on this unit resulted in different pairs being joined from the norm. Consequently, the length of wire locking between two of them was greater and the routing was less direct.

Further analysis indicated that such alternative locking wire orientation was necessitated, on infrequent occasions, when dictated by the final rotational position of locking wire holes in the bolt heads once correctly torque tightened. It is possible that a significant number of units in service have this orientation of wire locking.
Incident Facts

Date of incident
May 26, 2017

Classification
Incident

Airline
Flybe

Flight number
BE-292

Aircraft Registration
G-PRPH

ICAO Type Designator
DH8D

This article is published under license from Avherald.com. © of text by Avherald.com.
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