# NTSB ENG10WA052: Boeing 747, Hong Kong, China, September 21, 2010

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Foreign investigation
- Date: September 21, 2010, 09:30 local (09:30 UTC)
- Place: Hong Kong, China
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Defining event: [Taxi-into takeoff position: Landing gear collapse](https://openairdocs.org/ntsb-events/094)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Led by another country's authority
- NTSB office: Aviation Engineering Division
- Lead agency: Other
- Parties: Federal Aviation Administration
- NTSB case key (mKey): 77403
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ENG10WA052
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77403/pdf
- Page: https://openairdocs.org/ntsb/ENG10WA052

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Landing gear system: main landing gear](https://openairdocs.org/ntsb-findings/01023210): Aircraft › Aircraft systems · Failure (probable cause)

## Factual narrative

On September 21, 2010, 0930 Coordinated Universal Time (UTC), an Air Cargo Germany, a Boeing B-747-412F,registered as D-ACGD, was performing a left turn to line up with Runway 25L for take-off 31C at Hong Kong International Airport. Just before finishing the left turn to line up for take-off, the pilots noticed a loud bang sound followed by a slight tilting of the aircraft to the left. The aircraft was disabled on the runway and subsequent inspection confirmed the failure of the outer cylinder of left main landing gear. There were no injuries among the four crew members on board. The airplane was not substantially damaged. The investigation is under the jurisdiction of the government of China. Further information pertaining to this accident may be obtained from: Civil Aviation Department Accident Investigation Division Hong Kong, China 46/F, Queensway Government Offices 66 Queensway, Hong Kong Tel: (852) 29106821 (24 hours) Fax:(852) 29101177 (24 hours) http://www.cad.gov.hk/english/home.html Email: aid@cad.gov.hk AFTN: VHHHYAYX Cable: 22101 CAXTCN This report is for informational purposes only and contains only information obtained for, or released by, the Government of China.

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Taxi-into takeoff position: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event)

## Aircraft

- Registration: D-ACGD (not matched to a registry record)
- Reported make and model: BOEING 747 (412F)
- Category: Airplane
- Serial number: 24061
- Damage: Minor damage
- Flight: Part 129
- Operator: Air Cargo Germany, doing business as Air Cargo Germany
- Airworthiness certificate: Standard, Transport
- Destination: KGF, Karaganda
- Flight plan: Unknown
- Airport: HKG, Hong Kong Intl. Airport, runway 25L

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; injuries: none; airline transport; seat: left

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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