National Air Cargo flight ISAF95AQ - Boeing B747-400BCF (N-949CA)

National Air Cargo – Boeing B747-400BCF (N-949CA) flight ISAF95AQ

On April 29, 2013, about 1527 local time, a Boeing 747-400BCF, N-949CA, operated by National Air Cargo, Inc., dba National Airlines flight ISAF95AQ , crashed shortly after takeoff from Bagram Air Base, Bagram, Afghanistan. All seven crewmembers of National Airlines flight ISAF95AQ —the captain, first officer, loadmaster, augmented captain and first officer, and two mechanics—died, and the airplane was destroyed from impact forces and postcrash fire. The 14 Code of Federal Regulations Part 121 supplemental cargo flight, which was operated under a multimodal contract with the US Transportation Command, was destined for Dubai World Central – Al Maktoum International Airport, Dubai, United Arab Emirates.

  source : Aviation Accident Database youtube channel ©

The airplane’s cargo included five mine-resistant ambush-protected (MRAP) vehicles secured onto pallets and shoring. Two vehicles were 12-ton MRAP all-terrain vehicles (M-ATVs) and three were 18-ton Cougars.

The cargo represented the first time that National Airlines had attempted to transport five MRAP vehicles. These vehicles were considered a special cargo load because they could not be placed in unit load devices (ULDs) and restrained in the airplane using the locking capabilities of the airplane’s main deck cargo handling system.

National Air Cargo flight ISAF95AQ - Boeing B747-400BCF (N-949CA)
National Air Cargo flight ISAF95AQ – Boeing B747-400BCF (N-949CA)

Instead, the vehicles were secured to centerline-loaded floating pallets and restrained to the airplane’s main deck using tie-down straps. During takeoff of National Airlines flight ISAF95AQ , the airplane immediately climbed steeply then descended in a manner consistent with an aerodynamic stall. The National Transportation Safety Board’s (NTSB) investigation found strong evidence that at least one of the MRAP vehicles (the rear M-ATV) moved aft into the tail section of the airplane, damaging hydraulic systems and horizontal stabilizer components such that it was impossible for the flight crew to regain pitch control of the airplane.

Although the flight crewmembers and the loadmaster of National Airlines flight ISAF95AQ were aware that the cargo moved during the previous flight, they did not recognize that this indicated a serious problem with the cargo restraint methods.

The likely reason for the aft movement of the cargo was that it was not properly restrained. National Airlines’ procedures in its cargo operations manual not only omitted required, safety-critical restraint information from the airplane manufacturer (Boeing) and the manufacturer of the main deck cargo handling system (Telair, which held a supplemental type certificate [STC] for the system) but also contained incorrect and unsafe methods for restraining cargo that cannot be contained in ULDs. The procedures did not correctly specify which components in the cargo system (such as available seat tracks) were available for use as tie-down attach points, did not define individual tie-down allowable loads, and did not describe the effect of measured strap angle on the capability of the attach fittings.

The National Transportation Safety Board determines that the probable cause of this accident was National Airlines’ inadequate procedures for restraining special cargo loads, which resulted in the loadmaster’s improper restraint of the cargo, which moved aft and damaged hydraulic systems Nos. 1 and 2 and horizontal stabilizer drive mechanism components, rendering the airplane uncontrollable. Contributing to the accident was the Federal Aviation Administration’s inadequate oversight of National Airlines’ handling of special cargo loads.

 

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accident date: 29/04/2013
operator: National Air Cargo
make: Boeing
model: B747-400BCF
registration: N949CA
msn: 25630
location: Bagram,Afganistan
flight number: ISAF95AQ

Category: Aviation Accident

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