A B777 captain reported declaring an emergency after the EICAS tire pressure page showed two main ge...

Attributes
ACN	888095
Time
Date	201005
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Indicating and Warning - Landing Gear
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Emergency declared. An EICAS message 'tire pressure' illuminated about two hours into the flight. Tire 10 showed low pressure and continued to deflate throughout the remainder of the flight with tire pressure decreasing to about 111 psi. Tire 9 began to show decreasing tire pressure eventually ending at about 190 psi. Dispatch and maintenance were consulted with and a decision was made to declare an emergency for landing. After landing; emergency crew assessed tires 9 and 10 to be serviceable to with zero characteristics of damage or overheating. The aircraft was taxied to the gate normally.

Original NASA ASRS Text

Title: A B777 Captain reported declaring an emergency after the EICAS tire pressure page showed two main gear tires to have low air pressure. After landing the tires appeared to be normal.

Narrative: Emergency declared. An EICAS message 'Tire Pressure' illuminated about two hours into the flight. Tire 10 showed low pressure and continued to deflate throughout the remainder of the flight with tire pressure decreasing to about 111 PSI. Tire 9 began to show decreasing tire pressure eventually ending at about 190 PSI. Dispatch and Maintenance were consulted with and a decision was made to declare an emergency for landing. After landing; emergency crew assessed tires 9 and 10 to be serviceable to with zero characteristics of damage or overheating. The aircraft was taxied to the gate normally.

Data retrieved from NASA's ASRS site as of April 2012 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.

A B777 captain reported declaring an emergency after the EICAS tire pressure page showed two main gear tires to have low air pressure. After landing the tires appeared to be normal.