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ASN Wikibase Occurrence # 70431
Last updated: 22 October 2021
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Date:28-JAN-2009
Time:23:35
Type:Silhouette image of generic B752 model; specific model in this crash may look slightly different
Boeing 757-258
Owner/operator:Ghana International Airlines
Registration: G-STRZ
MSN: 27622/745
Fatalities:Fatalities: 0 / Occupants: 105
Other fatalities:0
Aircraft damage: None
Category:Serious incident
Location:Accra -   Ghana
Phase: En route
Nature:Passenger - Scheduled
Departure airport:Accra
Destination airport:
Investigating agency: AAIB
Narrative:
The aircraft had a blocked pitot tube, causing an airspeed discrepancy, which was detected early during the takeoff roll.
The commander decided to continue the takeoff and deal with the problem whilst airborne. After passing FL180 the crew selected the left Air Data switch to ALTN, believing this isolated the left Air Data Computer (ADC) from the Autopilot & Flight Director System (AFDS).
Passing FL316, the VNAV mode became active and the Flight Management Computer's (FMCs), which use the left ADC as their input of aircraft speed, sensed an overspeed condition and provided a pitch-up command to slow the aircraft. The co-pilot was concerned about the aircraft's behaviour and, after several verbal prompts to the commander, pushed the control column forward. The commander, uncertain as to what was failing, believed that a stick-pusher had activated. He disengaged the automatics and lowered the aircraft's nose, then handed over control to the co-pilot. A u201CMAYDAYu201D was declared and the aircraft returned to Accra. The operator's subsequent engineering investigation discovered the remains of a beetle-like creature in the left pitot system

Sources:

https://www.gov.uk/aaib-reports/boeing-757-258-g-strz-28-january-2009

Accident investigation:
cover
  
Investigating agency: AAIB
Status: Investigation completed
Duration:
Download report: Final report


Images:

Photo of G-STRZ courtesy AirHistory.net


London - Heathrow (EGLL / LHR)
2 June 2010; (c) Chris Lofting

Revision history:

Date/timeContributorUpdates
10-Dec-2009 12:22 harro Added
10-Dec-2009 12:23 harro Updated

Corrections or additions? ... Edit this accident description