Date: 201209
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Aircraft: Commercial Fixed Wing
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Parked
Aircraft component: Brake System
Component problem: Failed
Reporter organization: Air Carrier
Reporter function: Captain
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Human-Machine Interface
Anomaly: Aircraft Equipment Problem Critical; Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Flight Crew
When detected: Aircraft In Service At Gate
Result: General Release Refused / Aircraft Not Accepted; General Maintenance Action
Contributing factors: Aircraft; Airport; Human Factors; Weather
Primary problem: Aircraft

Narrative: MEL Item Brake Temperature Monitoring System; after reviewing the MEL item for brake indicator inoperative and the appropriate chart of the Flight Manual; and considering that the aircraft does a quick turnaround; my crew and I believed the temperature sensors should be fixed. We saw a B777 Check Captain in operations; who we consulted to make sure we were reading the charts correctly (we were). He called another B777 Check Captain and we all came to the same conclusion: fix the airplane. The brake cooling table referred to in the MEL shows that at 440;000 LBS flaps 30 auto brakes 2; we would be in the melt zone. According to the table; if we waited; did not use auto brakes; and delayed touching the brakes for 30 KTS after touchdown; we would still have at least 1 hour of cooling at a minimum. For such a seemingly small problem such as brake temp sensors; one would not think important issues such as melt zone would arise! I consulted the Duty Manager who told me that we should ask the destination station to put brake cooling fans on the airplane. My crew and I were trying to make the operation work; and to avoid any problems for ourselves and for the down line crews. I was disappointed that the Duty Manager did not understand the implications of taking this airplane. I had hoped that he would try to expedite our refusal; and the subsequent repair; of the aircraft; but he did not. I was; however; grateful to have an excellent crew who helped determine the ramifications of taking this airplane. Ultimately the repair took only 20 minutes; and the parts were in stock. My questions are: 1. Is it prudent to send an aircraft with a very restrictive MEL guidance (the table referred to in the MEL is very conservative) on such a flight with less than a two hour turn time? 2. If we had to use the brakes within 20 KTS of touchdown ground speed; we would have been in the melt zone (with a mandatory 1 hour before we could taxi or Maintenance could even approach the main gear). What would be the implications to us; the crew; if we accepted this airplane? 3. There was enough ground time on this aircraft for this to have been fixed before we ever got the paperwork. Why did it take my refusal to get the airplane fixed? After all of our efforts to keep the operation going; the crew was charged with a delay. (We did; however; arrive one minute early!)




Synopsis: B777 Captain refuses an aircraft when it is learned that the brake temperature system is MELed and the destination airport temperature is expected to be 118 degrees. After refusal the system is repaired in 20 minutes.