Accident Boeing 747-251B N627US, Friday 19 August 2005
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Date:Friday 19 August 2005
Type:Silhouette image of generic B742 model; specific model in this crash may look slightly different    
Boeing 747-251B
Owner/operator:Northwest Airlines
Registration: N627US
MSN: 21709/412
Year of manufacture:1979
Total airframe hrs:95270 hours
Engine model:Pratt & Whitney JT9D-7Q
Fatalities:Fatalities: 0 / Occupants: 340
Other fatalities:0
Aircraft damage: Substantial, written off
Location:Guam-A.B. Won Pat International Airport (GUM) -   Guam
Phase: Landing
Nature:Passenger - Scheduled
Departure airport:Tokyo-Narita Airport (NRT/RJAA)
Destination airport:Guam-A.B. Won Pat International Airport (GUM/PGUM)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Northwest Flight 74 was a scheduled flight from Tokyo-Narita Airport (NRT) to Guam (GUM). The flight up to the approach to Guam was uneventful. About 14::03:28, the local controller at Guam cleared flight 74 for the visual approach to runway 6L and subsequently cleared the flight to land.
About 14:05:56, the captain called for "gear down, flaps 20" and the first officer immediately responded "gear down." About 14:06:36, the captain requested, "flaps 25, the landing check." The landing gear warning horn then started. The first officer stated, "oh sorry," a crewmember stated, "we didn’t get a gear," and then the captain requested, "put it back to 20." About 14:06:47, the second officer stated "red gear light," and the landing gear warning horn sound stopped.
About 14:06:54, the captain stated, "uh, tell 'em we’re gonna have to go around. Hold out to the left here. Flaps ten." About 14:07:02, the first officer called the local controller and advised, "tower, Northwest 74, we’re gonna uh, do a go-around. We’d like to hold out to the west while we work on a problem." The local controller then cleared the flight to fly the runway heading and climb and maintain 2,600 feet.
During the go-around, the captain asked the second officer, "what do you have for the gear lights?" The second officer responded, "four here." When all gear are down and locked on the Boeing 747-200, the landing gear indication module located on the SO’s instrument panel has five green lights: one nose gear light above four main landing gear lights. The crew then read through the "Red Gear Light Remains On (After Gear Extension)" emergency/abnormal procedure from the cockpit operations manual to troubleshoot the problem. Although the checklist twice presented in boldface type that five lights must be present for the gear to be considered down and locked, the crew did not verbalize the phrase either time.
The captain did not directly request a count, and the second officer did not verbally confirm, the number of gear down annunciator lights that were illuminated; instead, the flight crew made only general comments regarding the gear, such as "all gear," "all green," or "got 'em all." Because the crew believed that all of the gear annunciator lights were illuminated, they considered all gear down and locked and decided not to recycle the landing gear or attempt to extend any of the gear via the alternate systems before attempting a second approach. During all communications with air traffic control, the flight crew did not specify the nature of the problem that they were troubleshooting.
The flight then positioned for another approach. About 14:15:27, the first officer radioed the controller, and the flight was subsequently cleared to land on runway 6L.
About 14:18:17, the airplane touched down, and, about 14:18:22, the second officer stated, "reversers normal." Three seconds later, the local controller radioed "Northwest 74, go around. Uh, negative, uh, nosewheel." Engine rpm increased and the second officer stated, "seventy percent," and then the first officer and second officer both stated "go around" multiple times. About 14:18:37 the local controller queried "Northwest 74, tower," but the first officer radioed "we’re unable."
About 14:18:51, the nose contacted the runway surface, and then the captain stated "standby with the evacuation checklist." The first officer then radioed the LC, asking if he could see any fire, and the local controller responded, "negative." About 14:19:56, the captain informed the passengers via the public address system that the nose gear had collapsed and that they were to remain seated. The captain then "saw smoke coming from an access hatch and told the flight attendants to evacuate.

PROBABLE CAUSE: "The flight crews' failure to verify that the number of landing gear annunciations on the second officer’s panel was consistent with the number specified in the abnormal/emergency procedures checklist, which led to a landing with the nose gear retracted."

Accident investigation:
Investigating agency: NTSB
Report number: DCA05MA095
Status: Investigation completed
Duration: 3 years and 4 months
Download report: Final report


Pacific Daily News



photo (c) A.B. Takasaki; Guam-A.B. Won Pat International Airport (GUM); 19 August 2005

photo (c) Werner Fischdick; Amsterdam-Schiphol Airport (AMS); 30 July 2001

photo (c) Arno Janssen; Amsterdam-Schiphol Airport (AMS); 1999

Revision history:


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