# NTSB LAX84LA349: Lockheed L-1011-385-3, N501PA, Los Angeles, CA, June 11, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 11, 1984, 14:03 local (21:03 UTC)
- Place: Los Angeles, CA
- Coordinates: 33.949962, -118.39981 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=33.9500&lon=-118.3998&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 157 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 24043
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX84LA349
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/24043/pdf
- Page: https://openairdocs.org/ntsb/LAX84LA349

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Airframe/component/system failure/malfunction, takeoff - initial climb
  - landing gear,normal retraction/extension assembly - failure,total (cause)

## Analysis

SHORTLY AFTER THE AIRCREW MOVED THE GEAR HANDLE FROM 'UP' TO 'OFF', DURING INITIAL CLIMB, THEY HEARD A LOUD BANG IN THE NOSEWHEEL AREA. THEY RETURNED TO THE ARPT & LANDED AFTER DUMPING FUEL. AN EXAM REVEALED THAT BOTH LOWER ATTACH LUGS ON THE NOSE GEAR CRANK ASSEMBLY HAD FAILED & ALLOWED THE RETRACT ACTUATOR ARM TO PENETRATE THE WHEEL WELL BULKHEAD & CARGO COMPARTMENT FLOOR. A METALLURGICAL EXAM REVEALED THAT THE LEFT LUG HAD FAILED IN OVERLOAD AFTER FAILURE OF THE RIGHT LUG. THE FRACTURE SURFACE OF THE RIGHT LUG WAS TOO BADLY DAMAGED FOR AN EVALUATION; HOWEVER, SOME INTERGRANULAR CORROSION WAS NOTED IN THE REMAINING FRACTURE FACE.

## Aircraft

- Registration: N501PA (not matched to a registry record)
- Reported make and model: LOCKHEED L-1011-385-3 (L-1011-385)
- Category: Airplane
- Serial number: 193Y-1176
- Airframe hours: 10064
- Engines: Rolls-Royce RB 211 50000 lbs thrust turbo fan
- Damage: Substantial damage
- Flight: Part 121
- Registered owner: Pan American World Airways Inc
- Airworthiness certificate: Standard, Transport
- Departed: LAX, LOS ANGELES, CA
- Destination: MIA, MIAMI, FL
- Flight plan: IFR
- Airport: LAX, Los Angeles Int'L, runway 25, 12,091 × 150 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 50; commercial, airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 15,783 total, 2,483 in this make and model, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 230° at 14 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 70 °F, dew point 52 °F
- Altimeter: 29.00 inHg
- Observed at: LAX, 1 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Incident 19840611052259I](https://openairdocs.org/incident/19840611052259I), Jun 11, 1984: Lkheed 10113853, Los Angeles, CA, Substantial damage. Nose gear retract system failed on takeoff. Returned. Landed nose gear up. Found a faulty retract actuator assembly

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

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