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ASN Wikibase Occurrence # 241338
Last updated: 21 October 2020
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Date:28-FEB-2020
Time:11:33 UTC
Type:Silhouette image of generic B738 model; specific model in this crash may look slightly different
Boeing 737-8B6 (WL)
Owner/operator:Royal Air Maroc - RAM
Registration: CN-RGJ
C/n / msn: 33072/3949
Fatalities:Fatalities: 0 / Occupants: 145
Other fatalities:0
Aircraft damage: None
Category:Serious incident
Location:London-Gatwick Airport -   United Kingdom
Phase: Take off
Nature:Passenger - Scheduled
Departure airport:London-Gatwick Airport (LGW/EGKK)
Destination airport:Casablanca-Mohamed V Airport (CMN/GMMN)
Investigating agency: AAIB
Narrative:
The crew were scheduled to operate a return flight from Casablanca International Airport in Morocco to London Gatwick Airport, U.K.. The outbound flight to Gatwick was uneventful.

The commander reported that the turnaround at Gatwick proceeded normally and the aircraft pushed back from stand as flight AT807 at 11:06 hrs. The co-pilot was the pilot flying for the return sector.

Runway 26L was in use, with a light southerly wind and rain. The cloud was broken at 900 ft and the temperature was 6°C. The flight crew planned to depart from intersection A, using flap 1 and an assumed temperature of 55°C. They had calculated take off speeds of V1 - 144 knots, VR - 152 knots, and V2 - 155 knots. The commander reported that these take off performance figures were loaded into the FMC on stand and no changes were required during the taxi to the runway.

The aircraft entered the runway at intersection A and was cleared for take off. At 80 knots the commander confirmed that the airspeed indications were normal and the flight crew were next expecting to hear the aircraft announce “V1” but, this automatic call did not occur.

When the commander realised the automatic call had not occurred, he checked his PFD and saw the V speed bugs were not displayed on the speed tape. He felt “the aircraft was slow” so he allowed it to accelerate whilst he evaluated the situation. He did not recall if the speeds were still displayed on his Control Display Unit (CDU). As the end of the runway approached, he instructed the co-pilot to initiate a smooth rotation. The aircraft took off and the remainder of the flight proceeded without further incident. No aircraft caution or warning messages were seen at any stage.

The commander reported the lack of the automatic call in the aircraft’s technical log after the flight. Subsequent investigation by the operator did not find any aircraft faults. The automatic calls worked normally on the preceding and subsequent flights.

Conclusion
During the take off roll, the “V1” automatic call did not occur and the take off speeds were not displayed on the PFD. This led to a late rotation. The incident shows that automatic calls may not always work as the flight crew expect and they should be ready to respond appropriately.

Sources:

1. AAIB Final Report: https://assets.publishing.service.gov.uk/media/5f3cf71d8fa8f51742515bf2/Boeing_737-8B6_CN-RGJ_09-20.pdf
2. http://avherald.com/h?article=4dc73766&opt=0
3. https://www.aeroinside.com/item/14902/royal-maroc-b738-at-london-on-feb-28th-2020-late-rotation-for-takeoff
4. https://www.flightglobal.com/safety/ram-737-carried-out-long-high-speed-take-off-after-call-out-hitch/140129.article

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

Media:

CN-RGJ Boeing 737-800 RAM landing at London Heathrow (LHR/EGLL) 24 June 2012, 16:59:CN-RGJ Boeing 737-800 RAM (8376560213)

Images:

Photo of CN-RGJ courtesy AirHistory.net


Amsterdam - Schiphol (EHAM / AMS)
29 August 2015; (c) Lewis Grant


Figure: AAIB

Revision history:

Date/timeContributorUpdates
13-Sep-2020 09:27 harro Added
13-Sep-2020 09:28 harro Updated [Photo, Accident report, ]
21-Oct-2020 22:30 Dr. John Smith Updated [Source, Embed code, Narrative, Accident report]

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