# NTSB ANC84IA066: British Aerospace BAE-146, N146AP, Unalaska, AK, May 12, 1984

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: May 11, 1984, 17:45 local (May 12, 1984, 01:45 UTC)
- Place: Unalaska, AK
- Coordinates: 53.900203, -166.40039 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=53.9002&lon=-166.4004&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 7 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4244
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC84IA066
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4244/pdf
- Page: https://openairdocs.org/ntsb/ANC84IA066

## Sequence of events

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

- Loss of control - on ground/water, landing
  - landing gear,normal brake system - inoperative (contributing factor)
  - maintenance - inadequate, company/operator management (cause)
  - improper decision, company/operator management (cause)
  - operation with known deficiencies in equipment - performed, pilot in command (cause)
  - brakes(emergency) - selected

## Analysis

A 'NO BRAKE CONDITION' WAS EXPERIENCED WHILE THE PLT WAS USING THE YELLOW BRAKE SYS DURING A LANDING. THE NORMAL LANDING PROCEDURE CALLS FOR USING THE GREEN SYS. DURING THE ROLL-OUT, THE PLT SELECTED THE EMERGENCY YELLOW SYS & SUBSEQUENTLY LOCKED THE BRAKES. HE STATED THAT THE YELLOW HYDRAULIC SYS WAS USED BECAUSE OF A PROBLEM WITH THE GREEN SYS ON THE PREVIOUS DAY. ALSO, HE REPORTED THAT MANAGEMENT HAD DECIDED TO USE THE YELLOW SYS. THE SPECIFIC LEVEL OF MANAGEMENT THAT HAD REPORTEDLY MADE THIS DECISION WAS NOT IDENTIFIED.

## Aircraft

- Registration: [N146AP](https://openairdocs.org/deregistered/N146AP-1990-06-20), registration cancelled 1990-06-20, S/N E1013 (OpenAirDocs)
- Reported make and model: BRITISH AEROSPACE BAE-146
- Registry model: [British Aerospace BAE 146 SERIES 100](https://openairdocs.org/model/british-aerospace-bae-146-series-100) (registry code 1500259) (OpenAirDocs)
- Category: Airplane
- Serial number: E1013
- Airframe hours: 240
- Engines: LYCOMING ALF 502 R-5 6970 lbs thrust turbo fan
- Damage: Minor damage
- Flight: Part 121
- Operator: Air Pac
- Registered owner: Cargill Leasing
- Airworthiness certificate: Standard, Normal
- Last inspection: Unknown, May 10, 1984, 43 hours before
- Departed: ADK, ADAK, AK
- Destination: DUT, UNALASKA, AK
- Flight plan: IFR
- Airport: DUT, Unalaska, runway 30, 3,900 × 100 ft, dirt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 57; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: right; flight hours: 26,000 total, 100 in this make and model, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 300° at 5 knots
- Visibility: 7 statute miles
- Lowest ceiling: 1,000 ft overcast

## 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 19840511076379I](https://openairdocs.org/incident/19840511076379I), May 11, 1984: Bac 146100A, Unalaska, AK, Minor damage. No braking on rollout. Used emergency system and brakes locked,blowing 4 tires. Improper use of emergency system.

## Other investigations on N146AP (1)

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.

- [NTSB SEA87IA127](https://openairdocs.org/ntsb/SEA87IA127), Jun 28, 1987: British Aerospace BAE-146-100 (N146AP), Las Vegas, NV, incident, minor damage

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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