# NTSB ANC88IA013: Cessna 402B, N5718M, Cordova, AK, October 26, 1987

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: October 26, 1987, 18:45 local (22:45 UTC)
- Place: Cordova, AK
- Coordinates: 60.790302, -145.610519 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=60.7903&lon=-145.6105&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 6 uninjured
- Status: Completed, report July 10, 1989
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4962
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC88IA013
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4962/pdf
- Page: https://openairdocs.org/ntsb/ANC88IA013

## Sequence of events

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

- Main gear collapsed, landing - roll
  - landing gear,main gear strut scissors - disconnected (cause)
  - gear pin - improper, company maintenance personnel (cause)
  - acft/equip,inadequate compliance determination, other maintenance personnel (cause)
  - inadeq substantiation process,inadeq documentation, other institution (contributing factor)
  - operation with known deficiencies in equipment - attempted, pilot in command (contributing factor)

## Analysis

THE COMPANY MAINTENANCE PERSONNEL WERE AWARE OF A SHIMMY PROBLEM BUT THEY THOUGHT IS WAS ONLY WORN BUSHINGS. THE MAINTENANCE PEOPLE STATED THEY INSPECTED THE PART BUT FOUND NO PROBLEM. THE PILOT-IN-COMMAND ALSO STATED HE FOUND NO PROBLEM UPON VISUALLY INSPECTING THE ASSEMBLY JUST PRIOR TO THE INCIDENT. THE RECORDS DO NOT INDICATE A LANDING GEAR CHANGE, HOWEVER, THE WRONG PART WAS INSTALLED AS OUTLINED IN THE PARTS MANUAL. FURTHERMORE, AN UNCERTIFICATED ASSISTANT TO THE DIRECTOR OF MAINTENANCE RELEASED THE AIRPLANE WITHOUT HAVING A QUALIFIED MECHANIC INSPECT THE GEAR. THE PILOT-IN-COMMAND ACCEPTED THE AIRPLANE WITH A KNOWN DEFICIENCY AND DID NOT ENTER THE DISCREPANCY UNTIL AFTER THE INCIDENT. THE LEFT MAIN LNDG GEAR COLLAPSED DURING LANDING. THE GEAR HAD 'WOBBLED' DURING TAXI AT ANCHORAGE. THE PLT AND A BAGGAGE HANDLER HAD INSPECTED THE GEAR AND FOUND NOTHING OUT OF ORDER. THE PLT TELEPHONED CO MAINTENANCE AND THE CO GEN MGR SAID THE CO WAS AWARE OF THE SHIMMY PROBLEM AND TO TAKE THE FLT.

## Aircraft

- Registration: [N5718M](https://openairdocs.org/deregistered/N5718M-2013-04-23), registration cancelled 2013-04-23, S/N 402B0354, built 1973 (OpenAirDocs)
- Reported make and model: CESSNA 402B
- Registry model: [Cessna 402B](https://openairdocs.org/model/cessna-402b) (registry code 207590P) (OpenAirDocs)
- Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 402B00354
- Airframe hours: 2128
- Engines: CONTINENTAL TSIO-520-E 300 horsepower reciprocating
- Damage: Minor damage
- Flight: Part 135
- Registered owner: Wilburs Inc.
- Airworthiness certificate: Standard, Utility; Standard, Normal
- Last inspection: Annual, October 2, 1987, 85 hours before
- Departed: ANC, ANCHORAGE, AK
- Destination: CDV, CORDOVA, AK
- Flight plan: IFR
- Airport: CDV, Cordova, runway 9, 7,500 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 30; commercial, flight instructor, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 1,982 total, 1,780 as pilot in command, 230 in the last 90 days

## Weather

- Conditions: Visual (VMC), Dusk
- Wind: 10° at 6 knots
- Visibility: 10 statute miles
- Lowest ceiling: 4,000 ft overcast
- Temperature: 45 °F, dew point 30 °F
- Altimeter: 29.00 inHg
- Observed at: CDV

## 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 19871026073559I](https://openairdocs.org/incident/19871026073559I), Oct 26, 1987: Cessna 402B, Cordova, AK, Substantial damage. Left main landing gear collapsed on landing. Shaft which holds lower arm of main gear failed. Incorrect part used.

## Other investigations on N5718M (3)

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 ANC88FA111](https://openairdocs.org/ntsb/ANC88FA111), Aug 18, 1988: Cessna 402B (N5718M), Mt. Torbet, AK, substantial damage, 2 fatal
- [NTSB ANC82DA047](https://openairdocs.org/ntsb/ANC82DA047), Jun 9, 1982: Cessna 402B (N5718M), Grayling, AK, substantial damage
- [NTSB ANC75AA060](https://openairdocs.org/ntsb/ANC75AA060), Feb 28, 1975: Cessna 402B (N5718M), Barrow, AK, 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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