# NTSB CHI92LA281: Cessna 172RG, N9578B, Wheeling, IL, September 5, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 5, 1992, 11:45 local (16:45 UTC)
- Place: Wheeling, IL
- Coordinates: 42.130893, -87.919143 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.1309&lon=-87.9191&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report June 30, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 15550
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI92LA281
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/15550/pdf
- Page: https://openairdocs.org/ntsb/CHI92LA281

## Probable cause

MAIN LANDING GEAR COLLAPSE AS A RESULT OF THE FAILURE OF A LANDING GEAR HYDRAULIC PUMP SEAL.

## Sequence of events

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

- Airframe/component/system failure/malfunction, approach
  - hydraulic system,seal - ruptured (cause)
  - fluid,hydraulic - loss,total
- Main gear collapsed, landing - roll
  - landing gear,main gear - unlocked (cause)

## Analysis

THE PILOT WAS MAKING PATTERN APPROACH FOR LANDING.  HE STATED THAT HE VISUALLY CONFIRMED THE LANDING GEAR WAS DOWN. DURING LANDING ROLLOUT BOTH MAIN LANDING GEAR COLLAPSED.  THE INVESTIGATION REVEALED THAT A SEAL ON THE LANDING GEAR HYDRAULIC PUMP HAD RUPTURED RESULTING IN LOSS OF SYSTEM FLUID.

## Aircraft

- Registration: [N9578B](https://openairdocs.org/aircraft/N9578B), registered now, S/N 172RG0895, built 1981 (OpenAirDocs)
- Reported make and model: CESSNA 172RG
- Registry model: [Cessna 172RG](https://openairdocs.org/model/cessna-172rg) (registry code 2072438) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 172RG0895
- Airframe hours: 3500
- Engines: LYCOMING O-360-F1A6 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: John R. Lindstaedt
- Registered owner: Sky-Vu Flyers
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, August 31, 1992, 50 hours before
- Departed: UMP, INDIANAPOLIS, IN
- Airport: PWK, Pal-Waukee, runway 16, 5,137 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 41; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 112 total, 15 in this make and model, 69 as pilot in command, 15 in the last 90 days, 6 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 190° at 6 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 81 °F, dew point 66 °F
- Altimeter: 30.00 inHg
- Observed at: PWK, 1 nm away

## 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 19920905035359A](https://openairdocs.org/incident/19920905035359A), Sep 5, 1992: Cessna 172RG, Chicago/Wheelin, IL, Substantial damage. Gear down indication but horn on landing approach. Went around beleived gear ok. Gear hydraulic pump seal ruptured.

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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