(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).
(3) On the overhead panel 20VU, make sure that the ENG1(2) FIRE pushbutton switch is released.
(4) Make sure that the access platform is in position.
Subtask 75-26-10-010-052
B. Get Access
(1) Make sure that the fan cowl doors are open: (Ref. TASK 71-13-00-010-040) FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR
(2) Make sure that the thrust reverser doors are open: (Ref. TASK 78-36-00-010-040) FOR 1000EM1 451AL, 452AR FOR 1000EM2
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461AL, 462AR
Subtask 75-26-10-040-051
C. Make sure that the thrust reverser is unserviceable (Ref. TASK 78-30-00-481-041).
4. Procedure
_________ R (Ref. Fig. 401/TASK 75-26-10-991-301, 402/TASK 75-26-10-991-302) Subtask 75-26-10-420-050
A. Install the Transient Bleed Valve (TBV).
PRE CFM SB 72-0255
(1) Clean the component interface and/or the adjacent area.
(2) Do an inspection of the component interface and/or the adjacent area.
(3) Remove the protective caps from the fuel inlet and drain ports of the TBV and from the air inlet and outlet ports of the TBV.
(4) Lubricate the threads of the bolts (60) with graphite grease (Material No. CP2101).
(5) Position the TBV (10) on the forward bracket so that the three mounting holes align with the three mounting holes on the forward bracket.
(6) Loosely install the bolts (60) with your hands to put the TBV (10) in position on the TBV forward bracket.
(7) Lubricate the threads of the bolts (80) with graphite grease (Material No. CP2101).
(8) Install the bolts (80) that attach the TBV (10) to the bracket (70) on the core engine.
(9) TORQUE the bolts (80) to between 62 and 68 lbf.in (0.70 and 0.76 m.daN).
(10) TORQUE the bolts (60) to between 62 and 68 lbf.in (0.70 and 0.76 m.daN).
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(11) Install the fuel manifolds as follows:
(a) Remove the protective caps on the air signal tube of the fuel manifold (40).
(b) Position the fuel manifold (40) to the forward face of the TBV (10).
(c) Lubricate the threads of the bolts (20) with graphite grease (Material No. CP2101).
(d) Install the seal gasket (50) between the pad of the fuel manifold
(40) and the forward face of the TBV (10).
(e) Put the bracket (150) for the junction box in position over the 6 o'clock hole of the fuel manifold (40).
(f) Install and tighten the bolts (20) with your hand on the 6 o'clock hole that attaches the fuel manifold (40) to the TBV (10).
(g) TORQUE the bolt (20) to between 62 and 68 lbf.in (0.70 and 0.76 m.daN).
(h) Install the bolts (20) and spacers (30) and tighten them with your hand on the 9 o'clock inboard hole and the two outboard holes that attach the fuel manifold (40) to the TBV (10).
(i) TORQUE the bolts (20) to between 62 and 68 lbf.in (0.70 and 0.76 m.daN).
(12) Install the TBV air inlet and air signal tubes as follows:
(a) Remove the protective caps from the TBV air inlet and air signal tubes (90) and (120).
(b) Install and tighten the clamp (100) that attaches the TBV air inlet tube (90) to the inlet port of the TBV (10).
(c) Install and tighten the clamp (110) that attaches the TBV air signal tube (120) to the outlet port of the TBV (10).
(13) Install the electrical connectors as follows:
(a) Remove the blanking caps from the electrical connectors (130) and
(140) and from the electrical connectors on the TBV (10).
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(b) Connect the electrical connectors (130) and (140) to the electrical connectors on the TBV (10). Tighten the connectors with your hand plus one-eighth of a turn. If necessary, use the soft-jawed pliers.
END PRE CFM SB 72-0255
Subtask 75-26-10-420-051
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