# NTSB NYC91LA062: Cessna P206, N4626F, Cleveland, OH, January 23, 1991

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: January 23, 1991, 09:00 local (14:00 UTC)
- Place: Cleveland, OH
- Coordinates: 41.490219, -81.66938 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=41.4902&lon=-81.6694&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 3 minor
- Status: Completed, report June 2, 1992
- Report: Approved by Office Director
- ADs cited in the narratives: AD 77-13-77, [AD 77-13-17](https://openairdocs.org/ad/77-13-17) (OpenAirDocs)
- NTSB case key (mKey): 36868
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC91LA062
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/36868/pdf
- Page: https://openairdocs.org/ntsb/NYC91LA062

## Probable cause

FATIGUE FAILURE OF THE NUMBER TWO PROPELLER BLADE ACTUATING PIN, DUE TO IMPROPER INSTALLATION OF THE PINS AND NON-COMPLIANCE WITH AN AIRWORTHINESS DIRECTIVE (AD 77-13-77).

## Sequence of events

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

- Airframe/component/system failure/malfunction, approach - vfr pattern - final approach
  - propeller system/accessories,pitch change mech - fatigue (cause)
  - maintenance,compliance with ad - not followed, other maintenance personnel (cause)
- Forced landing, descent - emergency
- Nose down, landing - flare/touchdown
  - terrain condition - rough/uneven
  - terrain condition - soft

## Analysis

AT APRX 1200' MSL, WHILE ON FINAL APCH TO RWY 23R, THE PLT & PSGR NOTED A 'DIFFERENT' SOUND FM THE PROP/ENG. THERE WAS A LOSS OF THRUST FM THE ENG. ALSO, A ROUGH OR OUT-OF-BALANCE COND WAS NOTED. THE PLT STATED HE WAS UNABLE TO MAINT ALT & WAS FORCED TO MAKE AN EMERG LNDG ABOUT 3/4 MI SHORT OF THE RWY. DRG THE LNDG, THE ACFT ENCTRD SOFT/UNEVEN TRRN & NOSED DOWN. NO PREIMPACT MECHANICAL PROBLEM WAS FND WITH THE ENG. A POST-ACDNT EXAM REVEALED THAT ALL 3 PROP BLADES WERE FREE TO ROTATE 360 DEG IN THEIR HUBS. FATIGUE FRACTURES WERE FND ON 2 OF THE 3 PROP BLADE ACTUATING PINS; FATIGUE STRIATIONS WERE FND ON 90 TO 95 PERCENT OF THE #2 PROP ACTUATING PIN & ABOUT 60 PERCENT ON THE #1 PROP PIN (B-3491 PINS). NEITHER OF THESE PINS HAD BEEN REWORKED TO SHORTEN THE THREADED END IAW AD 77-13-17, WHICH REFERENCED MCCAULEY SERVICE BULLETIN #99. DRG INSTLN, THE PINS HAD 'BOTTOMED OUT' IN THEIR RESPECTIVE TAPPED HOLES, WHICH PREVENTED PROPER SEATING. THE #3 PROP BLADE ACTUATING PIN WAS A CORRECT PIN (B-4460) & IT HAD NO PREIMPACT CRACK OR FAILURE.

## Aircraft

- Registration: [N4626F](https://openairdocs.org/aircraft/N4626F), registered now, S/N P206-0226, built 1966 (OpenAirDocs)
- Reported make and model: CESSNA P206
- Registry model: [Cessna P206A](https://openairdocs.org/model/cessna-p206a) (registry code 2073308) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: P206-0226
- Engines: CONTINENTAL IO-520-A 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Max Krumpe
- Airworthiness certificate: Standard, Normal
- Departed: HGR, HAGERSTOWN, MD
- Destination: CLE
- Airport: Cleveland-Hopkins Intl, runway 23R, 7,095 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 65; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 700 total, 200 in this make and model, 700 as pilot in command, 33 in the last 90 days, 3 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 10 statute miles
- Temperature: 16 °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 19910123000929A](https://openairdocs.org/incident/19910123000929A), Jan 23, 1991: Cessna P206A, Cleveland, OH, Substantial damage. Lost thrust and power on landing approach. Prop actuating pins broke. Improper installation. A d not complied.

## Other investigations on N4626F (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 NYC86LA126](https://openairdocs.org/ntsb/NYC86LA126), May 12, 1986: Cessna P206A (N4626F), Wellsboro, PA, substantial 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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