Incident Airbus A350-941 9V-SMS, Monday 28 January 2019

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Date:	Monday 28 January 2019
Time:	08:15 LT
Type:	Airbus A350-941
Owner/operator:	Singapore Airlines
Registration:	9V-SMS
MSN:	158
Year of manufacture:	2017
Engine model:	Rolls-Royce Trent XWB-84
Fatalities:	Fatalities: 0 / Occupants:
Other fatalities:	0
Aircraft damage:	Minor
Category:	Incident
Location:	Singapore-Changi International Airport (SIN/WSSS) - Singapore
Phase:	Standing
Nature:	-
Departure airport:	-
Destination airport:	-
Investigating agency:	TSIB Singapore
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
While unloading food carts from the aircraft, a catering truck damaged the aft-most door on the right side of the aircraft, the door hinge and the door frame.

Conclusions:
1 The catering truck had a higher-than-normal engine idle RPM. This resulted in excessive hydraulic pressure that led to the hydraulic scissor lift moving in a way that lowered the cabin platform.
2 The optimal engine idle speed of 900RPM desired by the truck manufacturer was not made known to the truck operator.
3 The rear control panel was not meant for raising the cabin platform during catering operation to aircraft.
4 In the existing design of the truck cabin safety system, any command from the cabin control panels (front or rear) would override the safety shoe’s safety mechanism to automatically cause a lowering of the cabin platform.

Accident investigation: