# NTSB NYC83LA150: MBB BO-105, N2908U, Nantucket, MA, June 23, 1983

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: June 23, 1983, 11:00 local (15:00 UTC)
- Place: Nantucket, MA
- Location: 41.2533° N, 70.0605° W: Placed by OpenAirDocs at NANTUCKET MEML (ACK), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.2533&lon=-70.0605&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 35208
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC83LA150
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/35208/pdf
- Page: https://openairdocs.org/ntsb/NYC83LA150

## 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
  - aircraft preflight - inadequate, pilot in command (cause)
  - rotorcraft flight control,cyclic control - jammed (cause)
  - cyclic - improper, other person (cause)
- Hard landing, takeoff - initial climb

## Analysis

THE HELICOPTER MADE A HARD LANDING DURING AN ABORTED TAKEOFF FOLLOWING A MEDICAL EVACUATION DEMONSTRATION AT NANTUCKET. AFTER THE PRESENTATION THE ACFT WAS CHANGED FROM A 2 LITTER CONFIGURATION. THE PILOT NOTED THAT THE CYCLIC RETENTION CAP WAS ON THE CYCLIC STICK MOUNTING POINT BUT DID NOT KNOW WHO PUT IT THERE. THE RACK WAS THEN PUT IN PLACE AND HELD THERE BY ONE OF THE RETAINING CLIPS AND THE STRETCHER MOUNTED IN POSTION. CONTROLS WERE CHECKED FOR FREEDOM OF MOVEMENT AND THE FLIGHT TOOK OFF. IN THE INITIAL CLIMB, CYCLIC WAS MOVED FORWARD WITH NO PROBLEM BUT LATER IN THE CLIMB THE NOSE CONTINUED UP AND FORWARD CYCLIC WAS ATTEMPTED BUT WOULD NOT GO FORWARD OF THE POSITION IT WAS IN. THE PILOT LOWERED COLLECTIVE AND DESCENDED HITTING THE GROUND TAIL LOW. THE ACFT BOUNCED AND COLLECTIVE WAS HELD DOWN UNTIL THE ACFT TWISTED TO A STOP. INVESTIGATION REVEALED THAT CONTROL INTERFERENCE BY A CYCLIC STICK RETENTION KNOB, INADVERTENTLY INSTALLED, PREVENTED FORWARD CYCLIC MOVEMENT BECAUSE OF CONTACT WITH THE LEFT LITTER RACK.

## Aircraft

- Registration: N2908U (not matched to a registry record)
- Reported make and model: MBB BO-105
- Category: Helicopter
- Serial number: S-586
- Airframe hours: 332
- Engines: ALLISON 250-C20B 425 lbs thrust turbo shaft
- Damage: Substantial damage
- Flight: Other work use, Part 91
- Registered owner: Mhc Helicopter Corp.
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, June 18, 1983, 2 hours before
- Departed: ACK, NANTUCKET, MA
- Destination: ACK
- Airport: ACK, Nantucket

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; flight instructor, commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; flight hours: 8,020 total, 361 in this make and model, 7,169 as pilot in command, 91 in the last 90 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 6 statute miles
- Lowest ceiling: none

## 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 19830623026739A](https://openairdocs.org/incident/19830623026739A), Jun 23, 1983: Bolkms BO105S, Nantucket, MA, Substantial damage. Unable to use forward cyclic on takeoff. Lowered collective. Crash landed. Cyclic retention cap blocked by litter.

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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