# NTSB FTW85FA283: Gates Learjet 35A, N613RR, Fort Worth, TX, July 12, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Field investigation · Final report
- Date: July 12, 1985, 04:09 local (09:09 UTC)
- Place: Fort Worth, TX
- Coordinates: 32.820606, -97.359947 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=32.8206&lon=-97.3599&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21562
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW85FA283
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21562/pdf
- Page: https://openairdocs.org/ntsb/FTW85FA283

## Sequence of events

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

- Airframe/component/system failure/malfunction, landing - roll
  - landing gear,anti-skid brake system - failure,partial (cause)
  - hydraulic system,line - incorrect (cause)
  - maintenance,installation - improper, company maintenance personnel (cause)
  - condition(s)/step(s) insufficiently defined, manufacturer (contributing factor)
  - maintenance,inspection - inadequate, company maintenance personnel (contributing factor)
  - condition(s)/step(s) insufficiently defined, manufacturer (contributing factor)
- Overrun, landing - roll
  - landing gear,anti-skid brake system - failure,partial (cause)
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - downhill (cause)
  - terrain condition - rough/uneven (cause)

## Analysis

THIS ACFT RAN OFF THE DEPARTURE END OF THE 4001' RUNWAY FOLLOWING A NORMAL APPROACH, TOUCHDOWN AND INITIAL BRAKING. AFTER ABOUT 1000' OF NORM BRAKING, THE ACFT BEGAN A DRIFT TO THE RIGHT WHICH WAS PARTIALLY OVERCOME BY FULL LEFT RUDDER AND ASYMMETRICAL BRAKES. AFTER DEPARTING THE RUNWAY THE ACFT ENCOUNTERED DOWN SLOPING TERRAIN WHICH CAUSED THE NOSE GEAR TO COLLAPSE AND BUCKLED THE RIGHT WING. INVESTIGATION REVEALED THAT THE BRAKE LINES ON THE LEFT MLG WERE REVERSED WHICH CAUSED ERRANT COMMAND SIGNALS TO BE TRANSMITTED TO THE ANTI-SKID CONTROL UNIT DURING HEAVY BRAKE APPLICATION, NEGATING THE ANTI-SKID FUNCTION. THE LINES HAD BEEN MIS-INSTALLED DURING THE PREVIOUS BRAKE OVERHAUL. IT WAS NOTED THAT THE MAINTENANCE MANUAL DOES NOT ADDRESS THE CRITICALITY OF PROPER HOSE INSTALLATION AND THAT EITHER HOSE MAY BE INSTALLED IN THE INBD OR OTBD BRAKE HOUSING PORTS. ACFT WAS NOT EQUIPPED WITH REVERSERS.

## Aircraft

- Registration: N613RR (not matched to a registry record)
- Reported make and model: GATES LEARJET 35A
- Category: Airplane
- Serial number: 35A-276
- Airframe hours: 2065
- Engines: GARRETT TPE-731-2-2B 3500 lbs thrust turbo fan
- Damage: Substantial damage
- Flight: Positioning, Part 91
- Operator: Million Air
- Registered owner: Quorum Sales
- Airworthiness certificate: Standard, Transport
- Last inspection: Continuous airworthiness, May 29, 1985, 57 hours before
- Departed: ADS, DALLAS, TX
- Airport: FTW, Meacham Fld, runway 16R, 4,001 × 75 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: helicopter, airplane; medical: class 1, valid medical--no waivers/lim.; seat: right; flight hours: 6,679 total, 1,065 in this make and model, 144 in the last 90 days, 66 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/bright
- Wind: calm
- Visibility: 7 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 68 °F
- Altimeter: 29.00 inHg
- Observed at: FTW

## 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 19850712033459A](https://openairdocs.org/incident/19850712033459A), Jul 12, 1985: Lear 35A, Fort Worth, TX, Substantial damage. Aircraft veered on rollout and crew was unable to stop before runway end. Found brake lines improperly installed.

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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