User:Whoop whoop pull up/UPS Airlines Flight 1307

UPS Airlines Flight 1307
	UPS 1307 on the ground after the extinguishment of the fire.
Accident
Date	7-8 February 2006
Summary	Inflight cargo fire of unknown origin
Site	Philadelphia International Airport, Philadelphia, Pennsylvania
Aircraft
Aircraft type	McDonnell Douglas DC-8-71F
Operator	UPS Airlines
IATA flight No.	5X1307
ICAO flight No.	UPS1307
Call sign	UPS 1307
Registration	N748UP
Flight origin	Hartsfield–Jackson Atlanta International Airport, near Atlanta, Georgia
Destination	Philadelphia International Airport, Philadelphia, Pennsylvania
Occupants	3
Passengers	0
Crew	3
Fatalities	0
Injuries	3
Survivors	3 (all)

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UPS Airlines Flight 1307 was a scheduled cargo flight from Hartsfield–Jackson Atlanta International Airport near Atlanta, Georgia to Philadelphia International Airport in Philadelphia, Pennsylvania. On the night of 7-8 February 2006, the McDonnell Douglas DC-8-71F operating the flight experienced a cargo fire while descending towards Philadelphia; the fire destroyed the aircraft after landing, but only minor injuries, and no fatalities, occurred to the three crew on board.^[1]

Accident[edit]

The flight proceeded normally until the descent towards Philadelphia. At 2334 Eastern Standard Time, as the flight descended through flight level 310 southwest of Washington, D.C., the aircraft's cockpit voice recorder (CVR) recorded comments by the flightcrew about an odor similar to burning wood. The captain briefly considered diverting the flight, but, as there was no evidence of a problem beyond the unusual odor, the flightcrew decided to continue to their destination.^[1]^[a] Over the next several minutes, the flightcrew attempted to troubleshoot the source of the odor, without success. At 2354:42, with the aircraft on approach into Philadelphia and descending through an altitude of 3,600 feet above mean sea level (AMSL), the crew received a warning of smoke in the main cargo compartment.^[1]^[b] The flight was cleared for a visual approach and landing to runway 27R, the captain notified the Philadelphia local controller, who activated the airport's ARFF units to respond to a possible aircraft fire, and the flightcrew donned their oxygen masks. Soon afterwards, at 2355:57, the flight engineer reported a warning of a fire in one of the aircraft's aft lower cargo compartments,^[c] which was rapidly followed by the failure of the captain's EFIS.^[1]^[d]

As the aircraft touched down on runway 27R at approximately 2359, visible smoke began to enter the cockpit and rapidly thickened; by the time the flightcrew finished shutting down the aircraft and evacuated on the runway, the smoke inside the cockpit was already so thick that the first officer could not see his hand in front of him while evacuating. At this time, both the flightcrew and the responding ARFF personnel reported that there was smoke but no visible fire;^[1]^[2] the first observation of flames occurred at about 0040, when firefighters opened the aircraft's right forward overwing hatch and saw fire between the tops of the cargo containers and the fuselage ceiling.^[1]^[2] ARFF personnel attempted to open the aircraft's main cargo door to allow them to remove cargo containers and attack the fire more directly, but had not been trained in the proper method of operating the door, and accidentally rendered the door inoperative when they attempted to force it open.^[1] Despite the firefighters' efforts, the crown of the fuselage burned through at about 0200; the fire was eventually extinguished through internal and external attack with water and firefighting foam around 0407.^[1]

Investigation[edit]

Search for the cause of the fire[edit]

Once the aircraft was towed clear of the runway, work immediately began with the aim of finding the source of the fire.^[1] An electrical fire was quickly ruled out, as none of the aircraft's wiring exhibited damage from electrical arcing, the flightcrew never noticed any electrical burning odor, and no anomalies occurred in the aircraft's electrical systems until well after the start of the fire; as a result, the investigation focused on the aircraft's cargo. The four lower-lobe cargo compartments were intact, with their contents completely undamaged by fire (although the third compartment from the front was sooted behind the cargo compartment liner, and some pieces of melted material had also dripped down from the main deck into the areas behind the cargo liner). It was clear that the seat of the fire had been in the aircraft's main-deck cargo compartment; this had been loaded with seventeen cargo containers and one aluminium cargo pallet (with the pallet occupying the rearmost cargo position), numbered from front to back. Of the five forwardmost cargo containers, the container in position 4 was empty, and none of the contents of the other four containers showed any smoke or fire damage (although all the containers exhibited sooting from the fire, and all except the two forwardmost showed fire damage to the container itself). The contents of the cargo containers in positions 6 and 7 exhibited smoke damage and some singeing. From position 8 rearwards (aft of the aircraft's overwing exit hatches), the contents of all the containers and the pallet exhibited fire damage; the most severe fire damage to the cargo and the interior of the aircraft occurred between positions 12 and 17, with the lowest point of fire damage to the fuselage in the vicinity of position 12.^[1]^[e]

The NTSB ruled out a fire origin in container 15, as all the container's contents were accounted for after the fire and none showed any signs of having been the source of the fire. Containers 16 and 17 were likewise ruled out, as the firefighters who first gained entry into the aircraft reported seeing no flames this far aft in the cargo compartment, but did report fire further forward, in the vicinity of containers 12 through 14; additionally, this area of the main-deck cargo compartment was directly above the lower-lobe compartment where the first smoke warning occurred during the flight. Numerous fire-damaged items were recovered from the main cargo compartment, including many items containing lithium-ion batteries. Lithium-ion batteries have been implicated in numerous instances of fires, both on aircraft and elsewhere; however, none of the items recovered could be definitively linked to the start of the fire.^[1]

In-flight fire-detection and -extinguishment issues[edit]

Analysis of the decision to continue to Philadelphia[edit]

The NTSB considered whether the flightcrew's decision to continue to their destination of Philadelphia was prudent, or whether they should have diverted to a closer airport after they first noticed the burning odor.^[1] When the odor first became apparent, Flight 1307 was starting to descend in the vicinity of Washington, D.C.; the investigators concluded that, had the flightcrew immediately diverted the flight at this point, it could, potentially, have landed at Dulles Airport in northern Virginia, or at Baltimore/Washington Airport or Andrews AFB in Maryland, five to ten minutes sooner than at Philadelphia. However, they also noted that the flightcrew, in the absence of any smoke or fire warnings or system failures, would have had no reason to believe that a situation warranting a diversion existed.^[1]

Notes[edit]

^ Air cargo flights often experience unusual odors from benign sources (such as from carrying unusual cargo or flying over a forest fire); thus, the odor smelled by Flight 1307's flightcrew did not, in the absence of other indications of trouble, constitute evidence of an emergency situation or warrant a diversion.^[1]
^ Like most freighter versions of passenger aircraft, the DC-8-71F has two types of cargo compartment: four lower cargo compartments, which are the same as the cargo compartments on an ordinary passenger airliner, and the main cargo compartment, which is in the place of the passenger cabin and is at least partially accessible from the cockpit in flight.
^ No fire damage was found in any of the four lower cargo compartments; the lower aft cargo fire warning was generated by infiltration of smoke from the fire in the main cargo compartment.
^ Additionally, between 2356:41 and 2357:59, the aircraft's flight data recorder ceased to record valid data for twelve of its seventeen recorded aircraft parameters; by the time the aircraft touched down, the only parameters for which valid data was still being recorded were magnetic heading, vertical and longitudinal acceleration, VHF microphone keying, and autopilot on/off.
^ Fires, including those on aircraft, tend to burn upwards rather than downwards; thus, the area where a fire originated can often be determined by finding where fire damage extends the lowest.