TM 55-1520-240-T
8-5.3
POWER TURBINE INLET TEMPERATURE SYSTEM OPERATIONAL CHECK AND EMERGENCY POWER INDICATING SYSTEM TEST (Continued)
8-5.3
TASK
RESULT
CAUTION
The following procedure simu-
lates engine overtemperature to
check out indicator and timer cir-
cuits. The timer will operate,
Pilot's and copilot's EMERG PWR lights (5) shall
therefore, follow procedures
be out. If not, replace NO. 1 ENGINE PTIT indica-
closely to avoid excessive time
tor (6).
being added to engine
overtemperature time.
14.
Have helper observe NO. 1 ENGINE PTIT in-
NO. 1 ENGINE timer (9) shall operate when PTIT
dicator (6). Increase millivolt output from
indication is between 890°C and 910°C. If not.
tester until NO. 1 ENGINE timer (9) starts
go to Task 8-5.9.
to operate.
NO. 1 ENGINE flag indicator (10) shall be striped.
If not, go to Task 8-5.10.
Pilot's and copilot's EMERG PWR lights (5) shall
be on. If not. go to Task 8-5.1.1.
15.
Immediately reduce tester output until NO. 1
NO. 1 ENGINE timer (9) shall stop. If it does not.
ENGINE PTIT indication is between 800°C
replace NO. 1 ENGINE PTIT indicator.
and 820C.
NO. 1 ENGINE flag indicator (10) shall remain
striped. If not, replace NO. 1 ENGINE PTIT indica-
tor.
Pilot's and copilot's EMERG PWR lights (5) shall
be out. If not, replace NO. 1 ENGINE PTIT indica-
tor.
16.
Disconnect test harness from plug (15).
Connect plug (15) to receptacle (16).
17.
Disconnect plug (15) at NO. 2 ENGINE
NO. 2 ENGINE timer (12) shall not be operating. If
disconnect shelf. Connect cable from tester
it is, replace NO. 2 ENGINE PTIT indicator.
into receptacle (1 6) with test harness T140.
Have helper observe NO. 2 ENGINE PTIT
NO. 2 ENGINE flag indicator (13) shall be black. If
indicator (6). Increase millivolt output from
it is striped, replace NO. 2 ENGINE PTIT indicator.
tester until PTIT indication is 8200C. Check
EMERG POWER panel (9).
TASK
RESULT
Pilot’s and copilot’s EMERG PWR lights (5) shall
be out. If not, replace NO. 1 ENGINE PTIT indica-
tor (6).
18.
Have helper observe NO. 2 ENGINE PTIT
Pilot's and copilot's EMERG PWR lights (5) shall
indicator (6). Increase millivolt output from
be out. If not, replace NO. 1 ENGINE PTIT indica-
tester until NO. 2 ENGINE timer (12) starts to
tor (6).
operate.
NO. 2 ENGINE timer (12) shall operate when PTIT
indication is between 890C and 910°C. If not.
go to Task 8-5.12.
19.
Immediately reduce tester output until NO. 2
NO. 2 ENGINE timer (12) shall stop. If it does not,
ENGINE PTIT indication is between 800°C
replace NO. 2 ENGINE PTIT indicator.
and 820C.
NO. 2 ENGINE flag indicator (13) shall remain
striped. If not, replace NO. 2 ENGINE PTIT indica-
tor.
Pilot's and copilot's EMERG PWR lights (5) shall
be out. If not, replace NO. 2 ENGINE PTIT indica-
tor.
20.
Disconnect test harness from plug (15).
Connect plug (15) to receptacle (16).
21.
Reset NO. 1 and NO. 2 ENGINE FLAG
RESET switches (11 and 14).
FOLLOW-ON MAINTENANCE
TM 55-1520-240-23:
Battery Disconnected
Electrical Power Off
Hydraulic Power Off
Close No. 1 Engine Work Platform
Close No. 1 Engine Lower Access Door
Close No. 2 Engine Work Platform
Close No. 2 Engine Lower Access Panel
END OF TASK
Change 1 8-81
