# NTSB DEN91LA082: Boeing DHC-6-300, N242CA, Denver, CO, June 12, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 12, 1991, 05:00 local (11:00 UTC)
- Place: Denver, CO
- Coordinates: 39.73069, -104.919425 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.7307&lon=-104.9194&mi=10
- Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report March 24, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 18097
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN91LA082
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/18097/pdf
- Page: https://openairdocs.org/ntsb/DEN91LA082

## Probable cause

THE PILOT'S FAILURE TO PERFORM AN ADEQUATE PREFLIGHT, I.E., NOT FOLLOWING THE CHECK LIST AND THE NORMAL BRAKE SYSTEM WAS INOPERATIVE AS A RESULT OF NO HYDRAULIC SYSTEM PRESSURE (HYDRAULIC SYSTEM CIRCUIT BREAKER NOT 'IN').

## Sequence of events

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

- Airframe/component/system failure/malfunction, standing - engine(s) operating
  - landing gear,normal brake system - no pressure (cause)
  - aircraft preflight - inadequate, pilot in command (cause)
  - checklist - not followed, pilot in command (cause)
- Loss of control - on ground/water, taxi
- On ground/water collision with object, taxi

## Analysis

AT DAWN, THE PILOT AND A MECHANIC WENT OUT TO PREFLIGHT THE AIRCRAT AND THEN FLY IT ON A LOCAL MAINTENANCE TEST FLIGHT.  THE HYDRAULIC SYSTEM CIRCUIT BREAKER WAS NOT 'IN' WHEN THE AIRCRAFT ENGINES WERE STARTED.  AS THE RIGHT ENGINE RPM BEGAN TO INCREASE, THE AIRCRAFT STARTED TO MOVE FORWARD.  THE PILOT APPLIED THE BRAKES ONLY TO DISCOVER THERE WAS NO HYDRAULIC PRESSURE IN THE BRAKE LINES.  BEFORE CORRECTIVE ACTION COULD BE TAKEN, THE AIRCRAFT STRUCK A PARKED AIRCRAFT.

## Aircraft

- Registration: [N242CA](https://openairdocs.org/deregistered/N242CA-1998-04-09), registration cancelled 1998-04-09, S/N 342 (OpenAirDocs)
- Reported make and model: BOEING DHC-6-300
- Registry model: [Dehavilland DHC-6-300](https://openairdocs.org/model/dehavilland-dhc-6-300) (registry code 2802630) (OpenAirDocs)
- Category: Airplane
- Serial number: 342
- Engines: P&W PT6-27 680 horsepower turbo prop
- Damage: Substantial damage
- Flight: Business, Part 91
- Operator: Corporate Air, Inc.
- Airport: DEN, Stapleton International

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 29; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; flight hours: 5,521 total, 23 in this make and model, 5,384 as pilot in command, 93 in the last 90 days, 32 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Dawn
- Visibility: 15 statute miles
- Lowest ceiling: none

## 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 19910612021359A](https://openairdocs.org/incident/19910612021359A), Jun 12, 1991: Dhav DHC6300, Denver, CO, Substantial damage. Overlooked hydraulic circuit braker and parking brake on start up. No brake pressure ran into company aircraft.

## Other investigations on N242CA (1)

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.

- [NTSB LAX97LA157](https://openairdocs.org/ntsb/LAX97LA157), Apr 13, 1997: de Havilland DHC-6-300 (N242CA), Hilo, HI, destroyed. Probable cause: the pilot's inadequate en route fuel consumption calculations, which led to his failure to recognize a deteriorating fuel duration versus time-to-go situation in a more timely way.

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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