# NTSB ANC91LA026: MBB BO-105-CBS-4, N5413D, Valdez, AK, February 10, 1991

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: February 10, 1991, 11:55 local (15:55 UTC)
- Place: Valdez, AK
- Coordinates: 61.150447, -146.810379 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=61.1504&lon=-146.8104&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 3 uninjured
- Status: Completed, report December 4, 1992
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5518
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC91LA026
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5518/pdf
- Page: https://openairdocs.org/ntsb/ANC91LA026

## Probable cause

WAS THE PILOT-IN-COMMAND'S FAILURE TO PROPERLY USE THE APPROVAL CHECKLIST, IMPROPER PROCEDURES AND DIRECTIVES.

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, maneuvering
  - fuel system,electric boost pump - not switched (cause)
  - checklist - not used, pilot in command (cause)
  - procedures/directives - not followed, pilot in command (cause)
- Forced landing, descent - emergency
- Roll over, landing - flare/touchdown

## Analysis

APPROXIMATELY 30 MINUTES AFTER TAKEOFF ONE ENGINE QUIT.  THE PILOT ELECTED AN EMERGENCY LANDING IN THE WATER. EXAMINATION OF THE HELICOPTER WRECKAGE REVEALED THE PILOT DID NOT TURN ON THE 4 FUEL PUMPS PRIOR TO TAKEOFF AS REQUIRED BY THE AIRCRAFT FLIGHT MANUAL.

## Aircraft

- Registration: [N5413D](https://openairdocs.org/deregistered/N5413D-1993-08-05), registration cancelled 1993-08-05, S/N S 786 (OpenAirDocs)
- Reported make and model: MBB BO-105-CBS-4 (BO-105-CBS)
- Registry model: [Messerschmitt BO105CBS](https://openairdocs.org/model/messerschmitt-bo105cbs) (registry code 5626008) (OpenAirDocs)
- Category: Helicopter
- Serial number: 5786
- Airframe hours: 3472
- Engines: ALLISON 250-C20B 420 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Part 135
- Operator: Heli-Lift, Inc.
- Registered owner: Heli-Lift, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, January 31, 1991, 58 hours before
- Flight plan: Company VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 34; private, airline transport; airplane ratings: single-engine land; instrument ratings: helicopter; medical: class 1, valid medical--no waivers/lim.; seat: right; flight hours: 2,779 total, 295 in this make and model, 2,589 as pilot in command, 143 in the last 90 days, 35 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 160° at 3 knots
- Visibility: 20 statute miles
- Lowest ceiling: 20,000 ft overcast
- Temperature: 36 °F, dew point 27 °F
- Altimeter: 29.00 inHg

## FAA reports on this event (1)

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

- [Accident 19910210001909A](https://openairdocs.org/incident/19910210001909A), Feb 10, 1991: Bolkms BO105CBS, Valdez, AK, Substantial damage. Lost power on overwater climbout and ditched. Had failed to turn on required boost pump switches.

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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