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NOTE
When performing the HYD LEAK TEST,
all leak detection/isolation system compo-nents are checked electrically. Manually
holding the HYD LEAK TEST switch in
the test position does not allow the leak
detection/isolation system to be checked au-tomatically. It manually holds the circuits
open. The switch must be placed in the
TEST position and released.

a.  
HYD LEAK TEST switch -TEST. #1 TAIL RTR SERVO, BOOST SERVO OFF, SAS OFF, #1 and #2 RSVR LOW, BACK-UP RSVR LOW, and MASTER CAUTION lights and #2 TAIL RTR SERVO ON and BACK-UP PUMP ON advisory legends on. During this check, it is normal for the collective and pedals to move slightly.

b.  
HYD LEAK TEST switch -RESET. The MFD legends in a. should go off. MAS-TER CAUTION light -Press to reset.

 

8-12 Change 4
NOTE
If the backup pump is still running following the hydraulic leak test, cycle the BACKUP HYD PUMP switch to OFF then back to AUTO.
.
12. Tail rotor servo transfer -Check.
a.  BACKUP HYD PUMP switch -AUTO with backup pump not running.
NOTE
Failure of the BACK-UP PUMP ON advi-sory legend or the #2 TAIL RTR SERVO ON advisory legend indicates a failure in the leak detection/isolation system.
b.  
TAIL SERVO switch -BACKUP. #1 TAIL RTR SERVO caution legend on and #2 TAIL RTR SERVO ON and BACK-UP PUMP ON advisory legend on within 3 to 5 seconds.

c.  
TAIL SERVO switch -NORMAL. #1 TAIL RTR SERVO caution legend and #2 TAIL RTR SERVO ON advisory leg-end off. BACK-UP PUMP ON advisory legend remains on for approximately 90 seconds.

*13. Engine warmup -Check if temperature is be-low -17°C (1°F).
a.  
At temperatures between -17°C (1°F) and -43°C (-45°F), warm engines at IDLE for 3 minutes.

b.
At  temperatures between -43°C (-45°F) and -54°C (-65°F), warm engines at IDLE for 5 minutes.

 

8.23 ENGINE RUNUP.
*1. Flight controls -Hold.

Restrict the rate of ENG POWER CONT lever’s movement, when the tailwheel lockpin is not engaged. Rapid application of ENG POWER CONT levers can result in turning the helicopter, causing person-nel injury or loss of life.
*  
2. ENG POWER CONT lever(s) -FLY. *3. Droop stops -Check out 70% to 75% RPM R.

*
4. #1 and #2 GEN caution legends -Off.

O.
5. DEICE EOT -Check as required.

 

In ambient temperatures above 21°C (70°F), operate rotor at 100% RPM R for 5 minutes before doing the deice EOT check, to prevent blade overheating. Do not do the deice EOT check if OAT is above 38°C (100°F).
a.  
BLADE DE-ICE TEST select switch -EOT.

b.  
BLADE DEICE MODE select switch -MANUAL M.

c.  
BLADE DEICE POWER switch -ON.

d.  
TR DE-ICE FAIL caution legend and MASTER CAUTION lights on after 15 to 30 seconds, and MR DE-ICE FAIL cau-tion legend on after 50 to 70 seconds.

e.  
BLADE DEICE POWER switch -OFF. TR DE-ICE FAIL , MR DE-ICE FAIL legends, and MASTER CAUTION lights off.

f.  
BLADE DE-ICE TEST select switch -NORM.

NOTE
If helicopter engine was started using exter-nal air source and/or external ac power, the APU must be started to do APU generator backup check.
g.  GENERATORS NO. 1 or NO. 2 switch -OFF. Applicable GEN legend and MAS-TER CAUTION lights on.
Change 4 8-13

h.  
BLADE DEICE POWER switch -ON. Wait 30 seconds, no deice lights on.

i.  
GENERATORS switch(es) -ON. Appli-cable GEN caution legend(s) off.

j.  
BLADE DEICE POWER switch -OFF.

k.  
BLADE DEICE MODE select switch -AUTO.

 

*6. % TRQ 1 and 2 -Matched within 5%.
*
7. FUEL PUMP switch -OFF.
　
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