# NTSB CHI86FA218: Learjet 24, N88JF, Ypsilanti, MI, September 3, 1986

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Field investigation · Final report
- Date: September 3, 1986, 06:53 local (10:53 UTC)
- Place: Ypsilanti, MI
- Coordinates: 42.240348, -83.619049 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.2403&lon=-83.6190&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 13275
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI86FA218
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13275/pdf
- Page: https://openairdocs.org/ntsb/CHI86FA218

## Sequence of events

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

- In flight collision with terrain/water, missed approach (ifr)
  - missed approach - improper, copilot/second pilot (cause)
  - lack of total experience in type of aircraft, copilot/second pilot (contributing factor)
  - minimum descent altitude - exceeded, copilot/second pilot (cause)
  - overconfidence in personal ability, pilot in command (contributing factor)
  - supervision - improper, pilot in command (cause)
- Loss of engine power, climb
  - engine installation,suspension mounts - previous damage (cause)
- Fire, landing - roll
  - landing gear - previous damage (cause)

## Analysis

CREW ATTEMPTED ILS APPROACH WITH INDEFINITE CEILING AND RVR=O IN FOG. CO-PILOT AT CONTROLS. DURING MISSED APPROACH, ACFT CONTACTED RUNWAY WHERE GLIDESLOPE INTERSECTS TERRAIN WITH SUFFICIENT FORCE TO SHEAR ALL THREE LANDING GEAR. RIGHT ENGINE SPOLLED DOWN DURING CLIMBOUT. CREW DIVERTED TO DETROIT METRO AND EFFECTED NO GEAR LANDING. MINOR FIRE BROKE OUT DURING GROUND SLIDE. BOTH ALTIMETERS BENCH CHECKED WITHIN TOLERANCES.

## Aircraft

- Registration: [N88JF](https://openairdocs.org/deregistered/N88JF-1989-06-05), registration cancelled 1989-06-05, S/N 110 (OpenAirDocs)
- Reported make and model: Learjet 24
- Registry model: [Learjet 24A](https://openairdocs.org/model/learjet-24a) (registry code 5170304) (OpenAirDocs)
- Category: Airplane
- Serial number: 110
- Airframe hours: 8468
- Engines: GE CJ610-4 2580 lbs thrust turbo jet
- Damage: Substantial damage
- Fire: On-Ground
- Flight: Positioning, Part 91
- Registered owner: John L. Roper
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, August 25, 1986
- Departed: MKC, KANSAS CITY, MO
- Destination: YIP, YPSILANTI, MI
- Flight plan: IFR
- Airport: YIP, Detroit Willow Run, runway 5R, 7,522 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 25; commercial, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: right; flight hours: 3,468 total, 233 in this make and model, 3,216 as pilot in command, 220 in the last 90 days, 3 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Day
- Wind: calm
- Altimeter: 30.00 inHg
- Observed at: YIP

## 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 19860903086229A](https://openairdocs.org/incident/19860903086229A), Sep 3, 1986: Lear 24A, Detroit, MI, Substantial damage. During missed approach the aircraft impacted runway. Gear separated. Landed on gear up at alternate airport.

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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