(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a warning notice is in position to tell persons not to energize the FADEC 1(2).
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Subtask 73-11-20-010-054
B. Make sure that the fan cowl doors are open: (Ref. TASK 71-13-00-010-040) FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR
4. Procedure
_________
(Ref. Fig. 401/TASK 73-11-20-991-300)
Subtask 73-11-20-420-053
A. Preparation for Installation
(1) Remove blanking plugs or covers from the ports and orifices of the servo fuel heater (80), main oil/fuel heat exchanger (60) and fuel pump.
R (2) If necessary, lightly coat two new O-ring (90) and O-ring (95) with engine oil (Material No. CP2442) and install one O-ring on each of the two nipples (10).
(3) If necessary, lightly coat the two nipples (10) with engine oil (Material No. CP2442) and install one nipple on the FUEL IN and on the FUEL OUT ports of the servo fuel heater (80). Torque nipples (10) to between 360 and 400 lbf.in (4.06 and 4.52 m.daN). Safety the nipples with lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8001) or lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8002).
Subtask 73-11-20-210-052
R B. Do a check of gasket (70), gasket-seal (120) and gasket (155) (Ref. TASK R 70-21-00-918-002). If in good condition, use them again. If not, discard R and replace by new one (s).
NOTE : The gaskets (70), (120) and (155) are not expendable parts. They
____ are disposable items which you replace only if not in good condition.
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C. Installation of the Servo Fuel Heater
NOTE : Remove blanking plugs as you reconnect tubes.
____
(1) Lightly coat gasket (70) with engine oil (Material No. CP2442) and install on main oil/fuel exchanger (60) mating face.
(2) Place the servo fuel heater (80) on the main oil/fuel heat exchanger (60).
(3) Lightly coat the six mounting studs of main oil/fuel heat exchanger
(60) with graphite grease (Material No. CP2101).
(4) Place the fire detection loop bracket (40), at its correct location, over two of the studs. Install the six washers (20) and nuts (30). Tighten nuts (30) by hand.
(5) Torque nuts (30) to between 100 and 110 lbf.in (1.13 and 1.24 m.daN).
(6) Lightly coat gasket (120) with engine oil (Material No. CP2442). Lightly coat four bolts (110) with graphite grease (Material No. CP2101).
(7) Put the U-shaped OIL OUT tube (130) in its correct position between the OIL OUT port of the servo fuel heater (80) and the hose (100) to oil tank. Engage the gasket (120) in sandwich between the square flange of tube (130) and servo fuel heater. Then, engage the four bolts (110) and tighten them by hand. TORQUE the bolts (110) to between 47 and 51 lbf.in (0.53 and 0.57 m.daN).
(8) Engage the coupling nut (135) of the hose (100) on the fitting of OIL
OUT tube (130). Tighten by hand.
R TORQUE the coupling nut (135) to between 900 and 1100 lbf.in (10.17
R and 12.43 m.daN). Safety the coupling nut (135) with lockwire 0.032
in. (0.8 mm) dia. (Material No. CP8001) or lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8002).
(9) Lightly coat the FUEL OUT nipple (10) with engine oil (Material No. CP2442).
(10) Engage by hand the coupling nut of FUEL OUT hose (140) on FUEL OUT nipple (10) of the servo fuel heater (80). TORQUE the coupling nut to between 650 and 770 lbf.in (7.34 and 8.70 m.daN).
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