# NTSB DEN84IA241: de Havilland DHC-7-100, N9058P, Denver, CO, July 29, 1984

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: July 29, 1984, 03:58 local (09:58 UTC)
- Place: Denver, CO
- Coordinates: 39.740089, -104.860588 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.7401&lon=-104.8606&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 6 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16275
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN84IA241
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16275/pdf
- Page: https://openairdocs.org/ntsb/DEN84IA241

## 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
  - landing gear,main gear shock absorbing strut - separation (cause)
  - maintenance,installation - improper, company maintenance personnel (cause)
  - information unclear, manufacturer (contributing factor)
  - landing gear,main gear - separation (cause)

## Analysis

THE LEFT MAIN LANDING GEAR WAS DISASSEMBLED & REASSEMBLED BY COMPANY MAINTENANCE PERSONNEL & THE ACFT WAS BEING FERRIED TO ANOTHER BASE FOR PERMANENT LANDING GEAR REPAIRS. DURING TAKEOFF, THE LEFT MAIN LANDING GEAR AND SHOCK STRUT SEPERATED FROM THE ACFT. THE PLT MADE AN EMERG LANDING WITHOUT THE LEFT MAIN GEAR WHEELS. AN EXAM OF THE GEAR REVEALED THAT THE UPPER BEARING HALVES & PISTON DAMPING RING WERE INSTALLED USING THE MAINTENANCE MANUAL. REVIEW OF THE MAINTENANCE MANUAL REVEALED THAT THE LANDING GEAR ASSEMBLY PROCEDURES WERE MISLEADING. THE MANUFACTURER ISSUED A TEMP REVISION TO THE MANUAL FOR LANDING GEAR ASSEMBLY.

## Aircraft

- Registration: N9058P (not matched to a registry record)
- Reported make and model: de Havilland DHC-7-100
- Category: Airplane
- Airframe hours: 13436
- Engines: P&W PT6-50 500 horsepower turbo prop
- Damage: Minor damage
- Flight: Ferry, Part 91
- Registered owner: Aor [Acofoc Associates
- Last inspection: Continuous airworthiness, July 22, 1984, 53 hours before
- Departed: CPR, CASPER, WY
- Destination: DEN, DENVER, CO
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 28; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 280° at 5 knots
- Visibility: 20 statute miles
- Lowest ceiling: 25,000 ft overcast
- Temperature: 64 °F, dew point 54 °F
- Altimeter: 30.00 inHg
- Observed at: DEN

## 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 19840729076399I](https://openairdocs.org/incident/19840729076399I), Jul 29, 1984: Dhav DHC7100, Denver, CO, Minor damage. Maintenance had restrained gear with cable for ferry. Cable broke, gear separated. Landed minus wheel assembly.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.