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ASN Wikibase Occurrence # 191303
Last updated: 15 October 2019
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Date:13-JAN-2016
Time:11:15 UTC
Type:Silhouette image of generic B77W model; specific model in this crash may look slightly different
Boeing 777-3M2ER
Owner/operator:TAAG Linhas Aereas de Angola
Registration: D2-TEI
C/n / msn: 43252/1198
Fatalities:Fatalities: 0 / Occupants: 278
Other fatalities:0
Aircraft damage: Minor
Category:Incident
Location:Lisboa-Portela de Sacavém Airport (LIS/LPPT) -   Portugal
Phase: Pushback / towing
Nature:International Scheduled Passenger
Departure airport:Lisboa-Portela de Sacavém Airport (LIS/LPPT)
Destination airport:Luanda Airport (LAD/FNLU)
Investigating agency: GPIAA Portugal
Narrative:
A Boeing 777-300ER operated by TAAG, D2-TEI, operated on a round trip from Luanda, Angola to Lisbon, Portugal. The flight to Lisbon was uneventful and the aircraft was parked at stand 146.
With a rotation of 4 hours on the ground, the aircraft was scheduled to fly back with a new crew at an estimated off blocks time of 10:00 UTC.
The commander of the flight, while performing the aircraft exterior inspection, found that the wings had accumulated ice on the upper surface and the underside surface, and that it was out of the operating limits.
As Lisbon Airport is not equipped with a de-icing system, the aircraft after being refueled with 9.604 kg of fuel and boarding of the passengers and cargo was towed to a position with a greater sun exposure (Multipurpose Ramp) to help the defrosting of the wings.
During the towing manoeuvre to the Multipurpose Ramp the underside of the right wing tip of the aircraft collided with a jet blast deflector.
This caused a scratch on the underside of the wing tip with a length of 8.5 inches, a maximum width of ¼ inch and a depth of 0.005 inches.

Cause of the Incident:
1. Tight tow maneuver of 180º turn of an aircraft of class E, in a platform that has an obstacle of 7 meters height (jet blast deflector);
2. The pushback procedure required to position the aircraft to avoid jet blast deflector as an obstacle;
3. Nonstandard pushback procedure used to position the Boeing 777-300ER on the desig-nated platform (Multipurpose Ramp);
4. No wing walker used to manage the wingtip clearance risk;

Contributing Factors:
1. The lack of marks on the ground in the Multipurpose Ramp, facilitating the towing maneuvers;
2. The difficulty of moving the jet blast deflector;
3. No clear pushback team organization;
4. Nonstandard Push back maneuvers risk mitigation not clearly defined;

Sources:

GPIAA

Safety recommendations:

Safety recommendation 14/2016 issued 16 June 2016 by GPIAA to ANA Aeropuertos de Portugal
Safety recommendation 15/2016 issued 16 June 2016 by GPIAA to ANA Aeropuertos de Portugal
Safety recommendation 16/2016 issued 16 June 2016 by GPIAA to ANA Aeropuertos de Portugal
Safety recommendation 17/2016 issued 16 June 2016 by GPIAA to TAAG
Safety recommendation 18/2016 issued 16 June 2016 by GPIAA to ANA Aeropuertos de Portugal
Safety recommendation 19/2016 issued 16 June 2016 by GPIAA to ANA Aeropuertos de Portugal, Ground ops, Airlines
Safety recommendation 20/2016 issued 16 June 2016 by GPIAA to ANA Aeropuertos de Portugal, airside stakeholders
Safety recommendation 21/2016 issued 16 June 2016 by GPIAA to ANA Aeropuertos de Portugal, Airport Safety, Airlines
Safety recommendation 22/2016 issued 16 June 2016 by GPIAA to Ground handling operators, airlines

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


Revision history:

Date/timeContributorUpdates
12-Nov-2016 21:33 harro Added

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