The crew of this boeing 777 cargo aircraft reported experiencing a 'fire cargo aft' warning while at...

Narrative:

A B777; flying at FL310; experienced a 'fire cargo aft' warning. The checklist was accomplished and the fire bottles were discharged. The fire indication remained. A divert was executed the nearest suitable airport; which was ZZZZ. Fuel dump was commenced using 'fuel jettison' checklist as the aircraft weight was at 701;000 lbs and the max landing weight of aircraft is 575;000 lbs. Approaching ZZZZ; control advised that the [airport] would not be open for several minutes and to expect 15 min of holding. At that time we diverted to ZZZZ1. At about this time the fire indication went away. Fuel dump was stopped at 10;000 feet and an over weight landing was completed safely at ZZZZ1 at 589;000 lbs. The aircraft was stopped on the runway and fire crews drove around the aircraft confirmed no obvious fire to fight. The aircraft was shut down with the APU running. 10 minutes after shutting down the aircraft the 'fire cargo aft' alert came on again. The aircraft was completely de-powered and the crew exited via crew stairs that were brought to the aircraft. At no time did the crew notice indication of smoke or fumes. Suspect undeclared [hazmat] caused cargo fire.

Original NASA ASRS Text

Title: The crew of this Boeing 777 cargo aircraft reported experiencing a 'Fire Cargo Aft' warning while at cruise altitude. They accomplished all appropriate checklists; coordinated a clearance with Air Traffic Control; and successfully diverted to a suitable airfield.

Narrative: A B777; flying at FL310; experienced a 'Fire Cargo Aft' Warning. The checklist was accomplished and the fire bottles were discharged. The fire indication remained. A divert was executed the nearest suitable airport; which was ZZZZ. Fuel dump was commenced using 'Fuel Jettison' checklist as the aircraft weight was at 701;000 lbs and the max landing weight of aircraft is 575;000 lbs. Approaching ZZZZ; control advised that the [airport] would not be open for several minutes and to expect 15 min of holding. At that time we diverted to ZZZZ1. At about this time the fire indication went away. Fuel dump was stopped at 10;000 feet and an over weight landing was completed safely at ZZZZ1 at 589;000 lbs. The aircraft was stopped on the runway and fire crews drove around the aircraft confirmed no obvious fire to fight. The aircraft was shut down with the APU running. 10 minutes after shutting down the aircraft the 'Fire Cargo Aft' alert came on again. The aircraft was completely de-powered and the crew exited via crew stairs that were brought to the aircraft. At no time did the crew notice indication of smoke or fumes. Suspect undeclared [Hazmat] caused cargo fire.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1311568
Time
Date	201511
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Oceanic
Flight Plan	IFR
Person 1
Function	Pilot Flying First Officer
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

The crew of this boeing 777 cargo aircraft reported experiencing a 'fire cargo aft' warning while at cruise altitude. They accomplished all appropriate checklists; coordinated a clearance with air traffic control; and successfully diverted to a suitable airfield.