Gear-up landing Accident de Havilland Canada DHC-8-402Q Dash 8 N213WQ, Saturday 7 April 2012
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Date:Saturday 7 April 2012
Time:11:08
Type:Silhouette image of generic DH8D model; specific model in this crash may look slightly different    
de Havilland Canada DHC-8-402Q Dash 8
Owner/operator:Colgan Air
Registration: N213WQ
MSN: 4213
Year of manufacture:2008
Total airframe hrs:7936 hours
Engine model:Pratt & Whitney Canada PW150A
Fatalities:Fatalities: 0 / Occupants: 35
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Houston-George Bush Intercontinental Airport, TX (IAH/KIAH) -   United States of America
Phase: Landing
Nature:Passenger - Scheduled
Departure airport:Little Rock, AR (LIT)
Destination airport:Houston-George Bush Intercontinental Airport, TX (IAH/KIAH)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
After take-off from the departure airport, the crew observed a master caution, an amber nose gear open advisory light, a landing gear inoperative caution light, and they noticed a different than normal airflow noise

During the flight, the crew heard a "thump" and noted that the previously observed caution lights had extinguished indicating that the nose gear was retracted and the nose gear doors were closed. In accordance with abnormal procedures checklists, and guidance from the company, the crew elected to use the Alternate Landing Gear Extension checklist to prepare for landing at the destination

After pulling the main gear release handle and the nose gear release handle the crew observed that the main landing gear indicated down and locked with green indicator lights, the nose landing gear did not indicate down and locked, and the red Nose Gear Unsafe light was illuminated. The crew landed the airplane with the main landing gear down and the nose landing gear retracted, and the airplane came to rest on the main gear and forward fuselage on the runway.

Post-accident, the nose gear was successfully extended multiple times using the alternate extension handle and the landing gear was also extended multiple times under hydraulic power with no anomalies noted. Testing of landing gear system components did not reveal any failures that should have prevented the gear from extending via the alternate extension method. The pull force required to extend the nose gear alternate release handle to a position where the nose gear released from the up and locked position was measured at approximately 72 lbs.

According to manufacturer's design requirements, the pull length on the alternate release handle should be approximately 11 inches with a force of 90 pounds.

A post-accident review of the alternate gear extension procedures was conducted in a full flight simulator by the investigation group with the participation of the accident flight crew. The pull force required and the pull length required to extend the nose gear using the alternate extension handle was determined to be significantly lower in the flight simulator as compared to the aircraft. There was no guidance contained in the alternate landing gear extension procedure specifying required pull forces when using the alternate extension handle. Subsequent to the accident, the manufacturer added details to the alternate landing gear extension procedure in the Airplane Flight Manual regarding the maximum pull forces that a pilot may experience when the alternate extension handle is pulled.
Probable Cause: the nose landing gear alternate release handle was not pulled with sufficient enough force or distance to release the uplocks and allow extension of the nose landing gear.

Contributing to the accident was the dissimilar pull force and pull length set on the flight simulator that was used for flight crew training of alternate landing gear extension procedures and the lack of information available to crew members advising of the dissimilar pull force.

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: DCA12FA058
Status: Investigation completed
Duration: 3 years and 4 months
Download report: Final report

Sources:

NTSB

History of this aircraft

Other occurrences involving this aircraft

4 July 2012 N213WQ United Express, opb Colgan Air 0 Houston-George Bush Intercontinental Airport, TX (IAH) sub

Location

Revision history:

Date/timeContributorUpdates
03-Apr-2014 16:09 Katonk2014 Added
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 20:37 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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