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For the last two days we have been struggling with a problem of high exhaust temperature trip on GT 2 , a frame six with Mark V controls.
First time it occurred I checked and found one check valve setting was at 60 psi and after replacing the problem got solved. It occurred again and this time I found two check valves had failed and I replaced them with new ones.
But this time I checked all the check valves and found them to be between 102 and 99 psi but it still tripped on the same problem. I have changed the Moog servo valve, serviced the fuel bypass valve but the problem is still persistent.
Yesterday evening it accepted to fire but could not accelerate beyond 2300 rpm, after which we found a union leak on the Compressor discharge pressure impulse line isolating valve. It was repaired and then the high exhaust temperature trip occurred on firing.
Conditions
1. The fuel pump discharge pressure was 104 psi and dropped to 60 after firing.
2. At start up the fuel percentage on the flow divider goes to 5.00% after firing it rises to 8.00% and trips.
If there is any information that I have left out and may be required to help in identifying the problem please let me know.
Please advise.
First time it occurred I checked and found one check valve setting was at 60 psi and after replacing the problem got solved. It occurred again and this time I found two check valves had failed and I replaced them with new ones.
But this time I checked all the check valves and found them to be between 102 and 99 psi but it still tripped on the same problem. I have changed the Moog servo valve, serviced the fuel bypass valve but the problem is still persistent.
Yesterday evening it accepted to fire but could not accelerate beyond 2300 rpm, after which we found a union leak on the Compressor discharge pressure impulse line isolating valve. It was repaired and then the high exhaust temperature trip occurred on firing.
Conditions
1. The fuel pump discharge pressure was 104 psi and dropped to 60 after firing.
2. At start up the fuel percentage on the flow divider goes to 5.00% after firing it rises to 8.00% and trips.
If there is any information that I have left out and may be required to help in identifying the problem please let me know.
Please advise.