# NTSB LAX86LA214: MBB BO-105S, N2784N, La Jolla, CA, May 9, 1986

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Limited investigation · Final report
- Date: May 9, 1986, 03:00 local (10:00 UTC)
- Place: La Jolla, CA
- Location: 32.8473° N, 117.2742° W: Placed by OpenAirDocs: center of La Jolla, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=32.8473&lon=-117.2742&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 2 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 25155
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX86LA214
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/25155/pdf
- Page: https://openairdocs.org/ntsb/LAX86LA214

## Sequence of events

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

- Loss of control - in flight, takeoff - initial climb
  - flt control syst,boost system - locked (cause)
  - maintenance,compliance with ad - improper, company maintenance personnel (cause)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE PILOT LOST CONTROL OF THE HELICOPTER'S ROTOR SYSTEM DURING THE INITIAL CLIMB PHASE OF THE FLIGHT. THE AIRCRAFT SPUN OUT OF CONTROL AND CRASHED ON AN INTERSTATE HIGHWAY. COMPANY MAINT APPLIED AD-85-26-02 TO DETECT OR PREVENT JAMMING OF ROTORCRAFT CONTROLS IN ACCORDANCE WITH SERVICE BULLETIN MBB BO-105 ON 1/1/86. THE ACFT HAD FLOWN 189 HRS SINCE THE MAINTENANCE WAS PERFORMED.

## Aircraft

- Registration: [N2784N](https://openairdocs.org/deregistered/N2784N-1990-03-19), registration cancelled 1990-03-19, S/N S633 (OpenAirDocs)
- Reported make and model: MBB BO-105S
- Registry model: [Messerschmitt-Boelkow-Blohm BO-105S](https://openairdocs.org/model/messerschmitt-boelkow-blohm-bo-105s) (registry code 5626006) (OpenAirDocs)
- Category: Helicopter
- Serial number: S-633
- Airframe hours: 869
- Engines: ALLISON 250-C20B 317 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Positioning, Part 91
- Operator: Evergreen Helicopters, Inc, doing business as [Ems]
- Registered owner: Metlife Capital Credit Corp.
- Airworthiness certificate: Standard, Utility; Standard, Normal
- Last inspection: Annual, November 8, 1985, 92 hours before
- Departed: LA JOLLY, CA
- Destination: MYF, SAN DIEGO, CA
- Flight plan: Company VFR
- Airport: Scripps Hosp. Helipad, runway 27, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 37; commercial, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane, helicopter; medical: class 2, valid medical--w/ waivers/lim; seat: right; flight hours: 5,353 total, 600 in this make and model, 29 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 120° at 5 knots
- Visibility: 7 statute miles
- Lowest ceiling: none
- Temperature: 57 °F, dew point 54 °F
- Altimeter: 29.00 inHg
- Observed at: SAN, 9 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).

- [Accident 19860509016709A](https://openairdocs.org/incident/19860509016709A), May 9, 1986: Bolkms BO105S, La Jolla, CA, Substantial damage. The helicopter lost longitudal control on takeoff. The actuator sleeve retaining plug had teflon tape on it.

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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