# NTSB BFO88IA001: Fokker F-28-MK-1000, N288N, Baltimore, MD, October 3, 1987

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: October 3, 1987, 11:00 local (16:00 UTC)
- Place: Baltimore, MD
- Coordinates: 39.170604, -76.670135 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.1706&lon=-76.6701&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 56 uninjured
- Status: Completed, report July 10, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 11380
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=BFO88IA001
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/11380/pdf
- Page: https://openairdocs.org/ntsb/BFO88IA001

## Sequence of events

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

- Gear not extended, approach
  - landing gear,gear locking mechanism - movement restricted (cause)
  - maintenance,installation - improper, company maintenance personnel (cause)
- Nose down, landing - roll
  - landing gear,nose gear - unlocked (cause)

## Analysis

THE ACFT HAD A MAIN GEAR ONLY LANDING AFTER THE NOSE GEAR FAILED TO LOCK DOWN. THIS WAS THE FIRST FLIGHT SINCE A NEWLY OVERHAULED NOSE GEAR WAS INSTALLED. IT WAS DETERMINED THAT WHEN THE NOSE GEAR WAS INSTALLED AND BEFORE IT WAS CORRECTED, A WRONG WASHER WAS USED WITH A BOLT TO INSTALL PART OF THE DOWNLOCK MECHANISM. THIS RESULTED IN AN UNDETECTED PERMANENT REDUCTION, BELOW THE DESIGN CLEARANCE BETWEEN THE DOWNLOCK PLUNGER AND ITS INTERNAL-BEARING. EXAMINATION OF THE DOWNLOCK AFTER THE LANDING INCIDENT DISCLOSED THAT THERE WAS SCORING OF THE PLUNGER AND ITS BEARING.

## Aircraft

- Registration: N288N (not matched to a registry record)
- Reported make and model: FOKKER F-28-MK-1000 (F-28-MK-10)
- Category: Airplane
- Serial number: 11054
- Airframe hours: 28534
- Engines: Rolls-Royce 555-15 9850 lbs thrust turbo jet
- Damage: Minor damage
- Flight: Part 121
- Registered owner: Piedmont Aviation
- Airworthiness certificate: Standard, Transport
- Last inspection: AAIP, October 2, 1987, 2 hours before
- Departed: GSO, GREENSBORO, NC
- Destination: BWI, BALTIMORE, MD
- Flight plan: IFR
- Airport: BWI, Baltimore-Washington, runway 33L, 9,519 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 31; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 9,600 total, 2,300 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 340° at 13 knots, gusting 20
- Visibility: 12 statute miles
- Lowest ceiling: 7,000 ft overcast
- Temperature: 55 °F, dew point 45 °F
- Altimeter: 29.00 inHg
- Observed at: BWI

## 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 19871003078049I](https://openairdocs.org/incident/19871003078049I), Oct 3, 1987: Fokker F28MK1000, Baltimore, MD, Minor damage. No nose gear down indication on approach with slow retraction at rollout. Improper washer in downlock mechanism.

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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