An air carrier widebody transport freighter had a main cargo compartment fire warning while on descent. There was no fire and no reported damage or injuries.

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Attributes
ACN	208639
Time
Date	199204
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : anc
State Reference	AK
Altitude	msl bound lower : 30000 msl bound upper : 30000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zan tracon : anc artcc : czyz
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach descent other landing other
Route In Use	arrival other enroute airway : zau
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 180 flight time total : 31335 flight time type : 922
ASRS Report	208639
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 17000
ASRS Report	208634
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency flight crew : exited adverse environment flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Shortly after start of descent, the main deck cargo smoke detector warning light illuminated. Emergency and normal checklist procedures were followed. Emergency declared and company notified at XX39Z. Descent and landing were uneventful. Aircraft was taxied clear of runways and after it was determined there was no immediate danger to the crew, aircraft was taxied to a remote area for inspection by anc fire team. After fire team found no evidence of fire and released aircraft, the aircraft was taxied to normal parking. It was discovered during the emergency that the so's oxygen mask hose was too short for him to reach the throttles. Also visibility was something of a problem due to the lack of a full face mask. East.g., with the oxygen mask and goggles over my tri- focal glasses, it was difficult to look outside and read the instrument panel at the same time. This necessitated bobbing my head up and down and I therefore elected to have the first officer make the landing. I can't recommend strongly enough the requirement for full face masks for all 'T' category aircraft.

Original NASA ASRS Text

Title: AN ACR WDB FREIGHTER HAD A MAIN CARGO COMPARTMENT FIRE WARNING WHILE ON DSCNT. THERE WAS NO FIRE AND NO RPTED DAMAGE OR INJURIES.

Narrative: SHORTLY AFTER START OF DSCNT, THE MAIN DECK CARGO SMOKE DETECTOR WARNING LIGHT ILLUMINATED. EMER AND NORMAL CHKLIST PROCS WERE FOLLOWED. EMER DECLARED AND COMPANY NOTIFIED AT XX39Z. DSCNT AND LNDG WERE UNEVENTFUL. ACFT WAS TAXIED CLR OF RWYS AND AFTER IT WAS DETERMINED THERE WAS NO IMMEDIATE DANGER TO THE CREW, ACFT WAS TAXIED TO A REMOTE AREA FOR INSPECTION BY ANC FIRE TEAM. AFTER FIRE TEAM FOUND NO EVIDENCE OF FIRE AND RELEASED ACFT, THE ACFT WAS TAXIED TO NORMAL PARKING. IT WAS DISCOVERED DURING THE EMER THAT THE SO'S OXYGEN MASK HOSE WAS TOO SHORT FOR HIM TO REACH THE THROTTLES. ALSO VISIBILITY WAS SOMETHING OF A PROBLEM DUE TO THE LACK OF A FULL FACE MASK. E.G., WITH THE OXYGEN MASK AND GOGGLES OVER MY TRI- FOCAL GLASSES, IT WAS DIFFICULT TO LOOK OUTSIDE AND READ THE INST PANEL AT THE SAME TIME. THIS NECESSITATED BOBBING MY HEAD UP AND DOWN AND I THEREFORE ELECTED TO HAVE THE FO MAKE THE LNDG. I CAN'T RECOMMEND STRONGLY ENOUGH THE REQUIREMENT FOR FULL FACE MASKS FOR ALL 'T' CATEGORY ACFT.

Data retrieved from NASA's ASRS site as of July 2007 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.