# NTSB LAX85IA023: Boeing 727-227, N722AA, Las Vegas, NV, October 17, 1984

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: October 17, 1984, 06:54 local (13:54 UTC)
- Place: Las Vegas, NV
- Coordinates: 36.080192, -115.139648 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=36.0802&lon=-115.1396&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 30 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 24554
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX85IA023
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/24554/pdf
- Page: https://openairdocs.org/ntsb/LAX85IA023

## Sequence of events

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

- Airframe/component/system failure/malfunction, climb - to cruise
  - electrical system,electric switch - erratic (cause)
  - flight control,slat - deployed inadvertently

## Analysis

AN UNCOMMANDED DEPLOYMENT OF THE #8 LEADING EDGE SLAT OCCURRED DURING A CLIMB. CONTROL OF THE ACFT WAS NOT AFFECTED & THE FLT CONTINUED TO THE DESTINATION. THE CREW ATTEMPT TO RECYCLE THE SLATS, BUT TO NO AVAIL. AN EXAM OF THE #8 SLAT ACTUATOR DID NOT DISCLOSE A MALFUNCTION OR FAILURE. HOWEVER, BOEING DID REPORT THE ACTUATOR RETRACT LOCK SWITCH DISPLAYED EVIDENCE OF AN INTERMITTENT MALFUNCTION THAT COULD HAVE FALSELY INDICATED THAT THE ACTUATOR WAS RETRACTED, WHEN IN REALITY IT HAD NOT.

## Aircraft

- Registration: N722AA (not matched to a registry record)
- Reported make and model: BOEING 727-227
- Category: Airplane
- Serial number: 20730
- Airframe hours: 32671
- Engines: P&W JT8D-9 14500 horsepower turbo fan
- Damage: No damage
- Flight: Part 121
- Registered owner: American Airlines, Inc.
- Airworthiness certificate: Standard, Transport
- Last inspection: Continuous airworthiness, May 9, 1983, 4,241 hours before
- Departed: LAS, LAS VEGAS, NV
- Destination: LAX, LOS ANGELES, CA
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 58; airline transport, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left

## Weather

- Conditions: Visual (VMC), Day
- Wind: 230° at 22 knots, gusting 30
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 59 °F, dew point 34 °F
- Altimeter: 29.00 inHg
- Observed at: LAS, 10 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 19841017058109I](https://openairdocs.org/incident/19841017058109I), Oct 17, 1984: Boeing 727227, Los Angles, CA. Experienced unwanted extension of nr 8 leading edge flap. Replaced NR8 actuator.

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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