Westjet Encore DH8D at Vancouver on Aug 7th 2016, cabin did not depressurize

Last Update: August 24, 2016 / 19:23:02 GMT/Zulu time

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Incident Facts

Date of incident
Aug 7, 2016

Classification
Incident

Flight number
WS-3106

Aircraft Registration
C-GLWJ

ICAO Type Designator
DH8D

A Westjet Encore de Havilland Dash 8-400, registration C-GLWJ performing flight WS-3106 from Terrace,BC to Vancouver,BC (Canada) with 82 people on board, was descending towards Vancouver when the crew noticed the cabin did not depressurize properly. At 4000 feet the crew advised ATC they needed vectors for another approach, aborted the approach, completed the "Ram Air Ventilation" checklist and performed a second approach followed by a safe landing.

The Canadian TSB reported maintenance was unable to find the cause of the problem.

A Civil Aviation Safety Inspector (CASI) looked into the occurrence. During the descent the cabin differential did not decrease as normal, the crew switched to manual mode but without success. Descending through 10,000 feet the pressure differential was 3.5. As the pressure differential was greater than 1.0 the crew discontinued the approach and ran the Ram Air Ventilation checklist. After landing maintenance reset the aircraft power, opened and closed the outflow valve and tested the pressurization system with no anomalies. The CASI was satisfied with the information provided, no further action by Transport Canada will be required.
Aircraft Registration Data
Registration mark
C-GLWJ
Country of Registration
Canada
Date of Registration
Certification Basis
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TCDS Ident. No.
Manufacturer
Dehavilland
Aircraft Model / Type
DHC-8-402
ICAO Aircraft Type
DH8D
Year of Manufacture
Serial Number
Aircraft Address / Mode S Code (HEX)
Maximum Take off Mass (MTOM) [kg]
Engine Count
Engine Type
Main Owner
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Aircraft registration data reproduced and distributed with the permission of the Government of Canada.

Incident Facts

Date of incident
Aug 7, 2016

Classification
Incident

Flight number
WS-3106

Aircraft Registration
C-GLWJ

ICAO Type Designator
DH8D

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