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 (3) On the overhead panel 20VU, make sure that the ENG1(2) FIRE pushbutton switch is released.

 Subtask 75-21-10-010-059
 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 461AL, 462AR

 Subtask 75-21-10-040-055
 C. Make sure that the thrust reverser is unserviceable (Ref. TASK 78-30-00-481-041).
 4. Procedure
_________
 (Ref. Fig. 401/TASK 75-21-10-991-301)
 Subtask 75-21-10-420-051
 A. Installation of the HPTACC:
 (1) Install the HPTACC valve to the combustion case as follows:
 (a) Clean the component interface and/or the adjacent area.

 (b) Do a visual inspection of the component interface and/or the adjacent area.

 (c) Remove the blanking plugs from the 9th stage outlet port of the HPTACC valve (10) and the 9th stage air outlet elbow (120).

 (d) Position the new gasket (100) to the 9th stage outlet port of the HPTACC valve (10) and the 9th stage air outlet elbow (120).

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 (e) Install the bolts (110) to assemble the 9th stage outlet port of the HPTACC valve (10) and the 9th stage air outlet elbow (120).

 (f) TORQUE the bolts (110) to between 55 and 70 lbf.in (0.62 and 0.79 m.daN).

 (g) Remove the blanking plug from the combustion case boss (20) and the 4th stage inlet of the HPTACC (10).

 (h) Position the new gasket (30) to the combustion case boss (20).

 (i) Position the HPTACC valve (10) to the combustion case boss (20) and the bracket.

 (j) Install the bolts (40) to the 4th stage inlet of the HPTACC valve

 (10) and the combustion case boss (20).

 (k) Install the bolts (50), (60) that mount the HPTACC valve (10) to the bracket.

 (l) TORQUE the bolts (40) to between 55 and 70 lbf.in (0.62 and 0.79 m.daN).

 (m) TORQUE the bolts (50), (60) to between 55 and 70 lbf.in (0.62 and

 0.79 m.daN).
 (2) Install the 9th stage air inlet tube to the HPTACC as follows:

 (a) Remove the blanking plugs from the inlet of the 9th stage port of the HPTACC valve (10) and the outlet of the 9th stage air tube (70).

 (b) Position the new gasket (90) to the inlet of the 9th stage port of the HPTACC valve (10) and the 9th stage air tube (70).

 (c) Install the bolts (80) with your hand to secure the inlet of the 9th stage port of the HPTACC valve (10) and the 9th stage air tube (70).

 (3) Install the fuel manifold to the HPTACC valve as follows:

 (a) Remove the blanking plugs from the inlet port of the HPTACC valve

 (10) and the fuel manifold (290).

 (b) Position the new gasket (280) to the inlet port of the HPTACC valve (10) and the fuel manifold (290).

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R (c) Tighten the bolts (300), (310) with your hand to assemble the R fuel manifold (290) to the HPTACC valve (10).
 (4) Install the 4th/9th stage air outlet tube to the HPTACC valve as follows:

 (a) Remove the blanking plugs from the 4th stage outlet ports of the HPTACC valve (10) and the outlet port of the 9th stage elbow (120).

 (b) Remove the blanking plugs from the 4th/9th stage air outlet tube (140).

 (c) Position the new gasket (150) and gasket (155) between the outlet side of the 9th stage of the air outlet elbow (120) and the 4th/9th stage air outlet tube (140).

 (d) Install the bolts (160) and the nuts (130) with your hand.

 (e) Install the new seal ring (170) to the 4th stage outlet of the HPTACC (10) and the 4th/9th stage air outlet tube (140).

 (f) Secure the 4th stage outlet of the HPTACC (10) and the 4th/9th stage air outlet tube (140) with the V-band clamp (190).

 (g) Tighten the nut (180) of the V-band clamp (190) with your hand.

 (5) Torque the bolts as follows:

 (a) Torque the bolts (300), (310) of the fuel manifold (290) to between 55 and 70 lbf.in (0.62 and 0.79 m.daN).

 (b) TORQUE the nut (180) of the V-band clamp (190) to between 55 and 70 lbf.in (0.62 and 0.79 m.daN).
　
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