Installation of Nacelle Anti-Ice (NAI) Duct

A. Installation of the Nacelle Anti-Ice (NAI) Ducts
   (1) Removal of the protection covers:
     (a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine and adjacent components.
   (2) If necessary, install the Nacelle Anti-Ice (NAI) bumper plate (23) (Ref. AMM TASK 71-71-49-400-801):
     (a) Remove the four bolts (20), eight washers (19), four spacers (21) and four nuts (22) that attach the two middle clamp-block brackets together.
     (b) Apply a thin layer of Anti-Seize Compound (Material No.PU5-0003) to the threads of the four nuts (22).
     (c) Install the NAI bumper plate (23) on the two middle clamp-block brackets. Use the four bolts (20), eight washers (19), four spacers (21) and four nuts (22).
   (3) If necessary, install the link assemblies:
     (a) Install the five link assemblies (9), (10) and (11):
       1 Adjust the link assembly (9) to a nominal length of 2.57 in. (65.28 mm). Make sure that the threads of the link assembly rods cover the inspection hole.
       2 Adjust the two link assemblies (10) to a nominal length of 2.62 in. (66.55 mm). Make sure that the threads of the link assembly rods cover the inspection hole.
       3 Adjust the two link assemblies (11) to a nominal length of 2.50 in. (63.50 mm). Make sure that the threads of the link assembly rods cover the inspection hole.
       4 Apply a thin layer of Anti-Seize Compound (Material No.PU5-0003) to the threads of the 11 nuts (8).
       5 Install the link assembly (9) to the bracket with the bolt (5), two washers (6), bushing (7) and nut (8).
       6 Install the two link assemblies (10) to the brackets with the two bolts (5), four washers (6), two bushings (7) and two nuts (8).
       7 Install the two link assemblies (11) to the brackets with the two bolts (5),four washers (6), two bushings (7) and two nuts (8).
     (b) Install the two link assemblies (16) or (52):
       1 Adjust the two link assemblies (16) or (52) to a nominal length of 1.786 in. (45.36 mm). Make sure that the threads of the link assembly rods cover the inspection hole.
       2 Install the two link assemblies (16) or (52) to the brackets with the two bolts (17), four washers (6), two bushings (7), and two nuts (8).
     (c) Install the link assembly (16):
       1 Adjust the link assembly (16) to a nominal length of 1.786 in. (45.36 mm). Make sure that the threads of the link assembly rod covers the inspection hole.
       2 Install the link assembly (16) to the bracket with the bolt (37), two washers (6), bushing (7), and nut (8).
     (d) Install the link assembly (36):
       1 Adjust the link assembly (36) to a nominal length of 5.475 in. (139.06 mm). Make sure that the threads of the link assembly rods cover the inspection hole.
       2 Install the link assembly (36) to the bracket with the bolt (5), two washers(6), bushing (7) and nut (8).
     (e) Install the link assembly (39):
       1 Adjust the link assembly (39) to a nominal length of 3.50 in. (88.90 mm).
       2 Install the link assembly (39) to the bracket with the bolt (5), two washers (6), bushing (7) and nut (8).
     (f) Install the link assembly (42):
       1 Adjust the link assembly (42) to a nominal length of 4.86 in. (123.44 mm).
       2 Install the link assembly (42) on the bracket with the bolt (5), two washers (6), bushing (7) and nut (8).
   (4) Examine the thermosetting tape on the ducts (15) and (26):
     (a) If the thermosetting tape is not on the ducts (15) and (26), install the tape where the clamps will be. Do step 4.A.(4)(c)1_ thru step 4.A.(4)(c)5_, as necessary.
     (b) Examine the thermosetting tape for the insulation covers on the ducts (15) and (26). Make sure that the tape is not torn or loose. Make sure that the diameter of the duct and tape are the minimum distances for each location. Refer to step 4.A.(4)(c)1_ through step 4.A.(4)(c)5_ for the minimum distances.
     (c) If the tape is damaged or the diameters are too small, remove the thermosetting tape. Install the new tape as follows:
       1 Wind PU1-0012Tape, Thermosetting around the middle NAI duct (15) and the forward NAI duct (26) where you will install the two hose clamps (27) for the insulation cover (28). Wind one to six layers of tape on each duct, until the diameter of the duct and tape is a minimum of 1.75 in. (44.4 mm).
       2 Wind PU1-0012Tape, Thermosetting around the forward NAI duct (26) where clamps on the insulation cover (31) will be. Wind one to six layers of tape at each clamp location, until the diameter of the duct and tape is a minimum of 1.85 in. (47.0 mm).
       3 Wind PU1-0012Tape, Thermosetting around the forward NAI duct (26) where you will install the two hose clamps (33) and the hose clamp (51) for the insulation covers (32) and (34). Wind from one to six layers of tape at each clamp location, until the diameter of the duct and tape is a minimum of 1.85 in. (47.0 mm).
       4 Wind PU1-0012Tape, Thermosetting around the forward NAI duct (26) where you will install the two hose clamps (33) for the insulation cover (38) or (53). Wind from one to six layers of tape at each clamp location, until the diameter of the duct and tape is a minimum of 1.85 in. (47.0 mm).
       5 Wind PU1-0012Tape, Thermosetting around the forward NAI duct (26) where you will install the hose clamps (35), (45) and (46) for the insulation cover (40). Wind from one to six layers of tape at each clamp location, until the diameter of the duct and tape is a minimum of 1.85 in. (47.0 mm).
   (5) Install the aft NAI ducts:
     (a) Install the aft NAI duct (1):
       1 Put the seal (4) in the aft NAI duct (1).
       2 Apply Anti-Seize Compound (Material No.PU5-0005) to the threads of the three bolts (2).
       3 Attach the aft NAI duct (1) and seal (4) to the engine case with the three bolts (2) and three washers (3).
       4 Apply a thin layer of Anti-Seize Compound (Material No.PU5-0003) to the threads of the 11 nuts (8).
       5 Attach the aft NAI duct (1) to the three link assemblies (9), (10) and (11). Use the three bolts (5), six washers (6), three bushings (7) and three nuts (8).
     (b) Attach the upper anti-ice valve to the aft NAI duct (1). Use the V-retainer coupling (12) and seal (13) (Ref. AMM TASK 30-21-51-400-802).
     (c) Install the short NAI duct (14):
       1 Attach the short NAI duct (14) to the upper anti-ice valve. Use the V-retainer coupling (12) and seal (13).
       2 Turn the V-retainer coupling (12) so that the nut faces outboard from the engine on the aft side of the upper anti-ice valve. Tighten the V-retainer coupling (12) sufficiently to hold the short NAI duct (14) on the upper anti-ice valve.
       3 Attach the short NAI duct (14) to the link assembly (11). Use the bolt (5), two washers (6), bushing (7) and nut (8).
     (d) Attach the lower anti-ice valve to the short NAI duct (14). Use the V-retainer coupling (12) and the seal (13) (Ref. AMM TASK 30-21-51-400-803).
     (e) Install the middle NAI duct (15):
       1 Attach the middle NAI duct (15) to the lower anti-ice valve. Use the V-retainer coupling (12) and seal (13).
       2 Turn the V-retainer coupling (12) so that the nut faces down on the outboard side of the lower anti-ice valve. Tighten the V-retainer coupling (12) sufficiently to hold the middle NAI duct (15) on the lower anti-ice valve.
       3 If you did not apply the Anti-Seize Compound (Material No.PU5-0003) before in step 4.A.(2)(b), apply a thin layer of Anti-Seize Compound (Material No.PU5-0003) to the threads of the four nuts (22).
       4 Attach the middle NAI duct (15) and igniter cable bracket (18) to the NAI bumper plate (23). Use the four bolts (20), eight washers (19), four spacers (21) and four nuts (22).
       5 For Configuration 1, do the following:
         a Attach the middle NAI duct (15) to the two link assemblies (16). Use the two bolts (5), four washers (6), two bushings (7) and two nuts (8).
       6 For Configuration 2, do the following:
         a Attach the middle NAI duct (15) to the two link assemblies (52). Use the two bolts (5), four washers (6), two bushings (7) and two nuts (8).
     (f) Install the forward NAI duct (26):
       1 Put the forward NAI duct (26) in the lower bifurcation firewall.
       2 Attach the forward NAI duct (26) to the middle NAI duct (15). Use the V-retainer coupling (24) and seal (25).
       3 Attach the forward NAI duct (26) to the inlet cowl anti-ice duct. Use the V-retainer coupling (44) and seal (43).
       4 Install the lower bifurcation firewall (Ref. AMM TASK 72-21-11-400-801).
       5 Apply a thin layer of Anti-Seize Compound (Material No.PU5-0003) to the threads of the three bolts (29).
       6 Attach the forward NAI duct (26) to the lower bifurcation firewall with the three bolts (29) and three washers (30). Torque the bolts (29) to between 70 and 63 lbf.in (0.79 and 0.71 m.daN ) .

CAUTION: MAKE SURE THAT YOU INSTALL THE BOLT(S) IN THE DIRECTION(S) SHOWN IN THE ILLUSTRATION. IF YOU CHANGE THE DIRECTION(S), YOU CAN CAUSE DAMAGE TO THE INSULATION COVER(S).

       7 Attach the forward NAI duct (26) to the four link assemblies (10), (36), (39) and (42). Use the four bolts (5), eight washers (6), four bushings (7) and four nuts (8).

NOTE: Do not torque the nuts (8) at this time.

CAUTION: MAKE SURE THAT YOU INSTALL THE BOLT(S) IN THE DIRECTION(S) SHOWN IN THE ILLUSTRATION. IF YOU CHANGE THE DIRECTION(S), YOU CAN CAUSE DAMAGE TO THE INSULATION COVER(S).

       8 Attach the forward NAI duct (26) to the link assembly (16). Use the bolt (5), two washers (6), bushing (7) and nut (8).

NOTE: Do not torque the nut (8) at this time.

   (6) Connect the XDCR2 sense tube to the forward NAI duct (26) (Ref. AMM TASK 30-21-12-400-801).
   (7) Adjustment of the NAI ducts, the XDCR2 sense tube and the link assemblies:
     (a) Adjust the NAI ducts (1), (14), (15) and (26), the XDCR2 sense tube and the link assemblies (9), (10), (11), (16), (36), (39) and (42) to keep preload to a minimum. Make sure that the V-retainer couplings (12) and (24) are in the approximate position as shown in the illustration.
   (8) Tighten the bolts (2):
     (a) TORQUE the bolts (2) to between 70 and 63 lbf.in (0.79 and 0.71 m.daN ) .
     (b) Safety the two bolts (2) with a PU1-0002Cable, Safety.

NOTE: You can use PU1-0027Cable, Safety as an alternative to PU1-0002Cable, Safety.

     (c) Safety the bolt (2) and the ECS bolt with a PU1-0002Cable, Safety.
   (9) Tighten the V-retainer couplings (12), (24) and (44):
     (a) TORQUE the V-retainer couplings (12), (24) and (44) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN ) .
     (b) Tap around the outer surface of the V-retainer couplings (12), (24) and (44) with a HAMMER - FIBER.
     (c) TORQUE the V-retainer couplings (12), (24) and (44) again to between 70 and 55 lbf.in (0.79 and 0.62 m.daN ) .
     (d) Tap around the outer surface of the V-retainer couplings (12), (24) and (44) with a HAMMER - FIBER.
     (e) TORQUE the V-retainer couplings (12), (24) and (44) a third time to between 70 and 55 lbf.in (0.79 and 0.62 m.daN ) .
     (f) Tap around the outer surface of the V-retainer couplings (12), (24) and (44) with a HAMMER - FIBER.
     (g) TORQUE the V-retainer couplings (12), (24) and (44) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN ) .
   (10) Tighten the XDCR2 sense tube to the forward NAI duct (26) (Ref. AMM TASK 30-21-12-400-801).
   (11) Safety the link assembly (36) with PU1-0002Cable, Safety.
   (12) For Configuration 2, do the following:
     (a) Safety the two link assemblies (52) with PU1-0002Cable, Safety.
   (13) TORQUE the nuts (8) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN ) .
   (14) TORQUE the nuts (22) to between 27 and 23 lbf.in (0.31 and 0.26 m.daN ) .

CAUTION: WHEN YOU INSTALL THE INSULATION COVERS, BE CAREFUL NOT TO CAUSE DAMAGE TO THEM. DAMAGED, TORN OR RIPPED COVERS MUST BE REPLACED.

   (15) Installation of the insulation covers.

NOTE: Make sure that the hose clamps are in the positions shown in the illustration or in a position that provides easy access to the hose clamps.

     (a) Clean the surface along the longitudinal splitline of the insulation cover (31), the mating surface of the insulation cover (31) and the lower bifurcation firewall. Use PU2-0001Alcohol, Isopropyl on a clean Cloth (Material No.PU1-0001) . Remove the PU2-0001Alcohol, Isopropyl with a clean Cloth (Material No.PU1-0001) before it dries.
     (b) Apply a layer of the PR-1200 RTV Clear Prime Coat (Material No.PU4-0034) along the longitudinal splitline of the insulation cover (31) and the mating surface of the insulation cover (31) and the lower bifurcation firewall. Let the PR-1200 RTV Clear Prime Coat (Material No.PU4-0034) dry for at least 30 minutes, but not more than four hours, before you apply the Sealant (Material No.PU3-0013) . Refer to the instructions of the manufacturer.
     (c) Apply the Sealant (Material No.PU3-0013) to the mating surface of the insulation cover (31) and the lower bifurcation firewall. Also apply the sealant to the longitudinal splitline of the insulation cover (31). Refer to the instructions of the manufacturer.
     (d) Install the insulation cover (31) on the forward NAI duct (26). Tighten the clamps on the insulation cover (31) until they hold the cover tightly on the PU1-0012Tape, Thermosetting that you installed in step 4.A.(4)(c)2_. Do not tighten them too much.
     (e) Make sure that the Sealant (Material No.PU3-0013) fully cures before the aircraft flies. Refer to the instructions of the manufacturer for cure times.
     (f) Disconnect the wire harnesses from the spring clips on the B-flange bracket (50) adjacent to the link assembly (16) attached to the forward NAI duct (26).
     (g) Remove the two bolts (49), washers (47) and nuts (48) that attach the B-flange bracket (50) to flange B. Remove the B-flange bracket (50).
     (h) Clean the surface where the flaps of the insulation cover (34) make an overlap adjacent to the link assembly (16) and along the splitline. Use PU2-0001Alcohol, Isopropyl on a clean Cloth (Material No.PU1-0001) . Remove the PU2-0001Alcohol, Isopropyl with a clean Cloth (Material No.PU1-0001) before it dries.
     (i) Apply a layer of PR-1200 RTV Clear Prime Coat (Material No.PU4-0034) where the flaps of the insulation cover (34) make an overlap adjacent to the link assembly (16) and along the splitline. Let the PR-1200 RTV Clear Prime Coat (Material No.PU4-0034) dry for at least 30 minutes, but not more than four hours, before you apply the Sealant (Material No.PU3-0013) . Refer to the instructions of the manufacturer.
     (j) Make sure that the flaps of the insulation cover (34) make an overlap adjacent to the link assembly (16). Put a thick layer between 0.003 in. (0.076 mm) and 0.006 in. (0.152 mm) of the Sealant (Material No.PU3-0013) on the bottom of the top flap adjacent to the link assembly (16) and along the splitline.
     (k) Install the top piece of the cover (34) on the forward NAI duct (26).
     (l) Install the B-flange bracket (50) to flange B with the two bolts (49), two washers (47) and two nuts (48). Make sure that the bolts go through the holes in the adjacent brackets.
     (m) Torque the nuts (48) to between 100 and 90 lbf.in (1.13 and 1.02 m.daN ) .
     (n) Attach the wire harnesses to the spring clips on the B-flange bracket (50).
     (o) Install the insulation cover (32) and the bottom piece of the insulation cover (34) on the forward NAI duct (26). Use the clamp (46), the two clamps (33) and the clamp (51). Put the insulation cover (32) grommet on the link assembly (36) under the clamp (46). Put the clamps (33) and (51) on the PU1-0012Tape, Thermosetting that you installed in step 4.A.(4)(c)3_. Tighten the clamp on the insulation cover (32) and the clamps (33), (46) and (51) with your hand until they hold the insulation covers (32) and (34) tightly.

NOTE: Do not tighten the clamps (33), (46) and (51) more than 18 lbf.in (0.20 m.daN).

     (p) Push the flaps of the insulation cover (34) together until you see the Sealant (Material No.PU3-0013) come out from between the flaps. Fair the Sealant (Material No.PU3-0013) you pushed out along the edge of the flaps. Clean the sealant that is more than 0.120 in. (3.05 mm) from the edge of the flaps.
     (q) Hold the flaps of the insulation cover (34) together until the Sealant (Material No.PU3-0013) fully cures. Refer to the instructions of the manufacturer for cure times.
     (r) Safety the pieces of the insulation cover (32) together with PU1-0002Cable, Safety. Safety the pieces of the insulation cover (34) together with PU1-0002Cable, Safety.
     (s) Install the insulation cover (38) or (53) on the forward NAI duct (26). Use the two clamps (33) and clamp (46). Put the insulation cover (38) or (53) grommet on the link assembly (39) under the clamp (46). Put the clamps (33) on the PU1-0012Tape, Thermosetting that you installed in step 4.A.(4)(c)4_. Tighten the clamps (33) and clamp (46) with your hand until they hold the insulation cover (38) or (53) tightly.
     (t) Safety the pieces of the insulation cover (38) or (53) together with PU1-0002Cable, Safety.
     (u) Install the insulation cover (41) on the forward NAI duct (26) and inlet cowl anti-ice duct. Tighten the clamp on the insulation cover (41) until it holds the cover tightly. Do not tighten it too much.
     (v) Safety the pieces of the insulation cover (41) together with PU1-0002Cable, Safety.
     (w) For PRE SB GRAA320NEO-A-30-21-0001-00001-930A-D, do the following:
       1 Install the insulation cover (40) on the forward NAI duct (26). Use the two clamps (46), the clamp (45) and the clamp (35). Put the insulation cover (40) grommets on the link assemblies (10) and (42) under the clamps (46). Put the insulation cover (40) grommet on the XDCR2 sense tube under the clamp (35). Put the two clamps (46), the clamp (45) and the clamp (35) on the PU1-0012Tape, Thermosetting that you installed in step 4.A.(4)(c)5_. Tighten the clamp on the insulation cover (40) and the clamps (46), (45) and (35) with your hand until they hold the insulation cover (40) tightly.
     (x) For POST SB GRAA320NEO-A-30-21-0001-00001-930A-D, do the following:
       1 Clean the surface along the splitline of the insulation cover (40) adjacent to the link assembly (10) and the interior of the insulation cover (40) adjacent to the link assembly (10). Use PU2-0001Alcohol, Isopropyl on a clean Cloth (Material No.PU1-0001) . Remove the PU2-0001Alcohol, Isopropyl with a clean Cloth (Material No.PU1-0001) before it dries.
       2 Apply a layer of PR-1200 RTV Clear Prime Coat (Material No.PU4-0034) along the splitline of the insulation cover (40) adjacent to the link assembly (10) and the interior of the insulation cover (40) adjacent to the link assembly (10). Let the PR-1200 RTV Clear Prime Coat (Material No.PU4-0034) dry for at least 30 minutes, but not more than four hours, before you apply the Sealant (Material No.PU3-0013) . Refer to the instructions of the manufacturer.
       3 Apply the Sealant (Material No.PU3-0013) along the splitline of the insulation cover (40) adjacent to the link assembly (10). Refer to the instructions of the manufacturer.
       4 Install the insulation cover (40) on the forward NAI duct (26). Use the clamp (46), the clamp (45) and the clamp (35). Put the insulation cover (40) grommet on the link assembly (42) under the clamp (46). Put the insulation cover (40) grommet on the link assembly (10) adjacent to the end of the cover. Put the insulation cover (40) grommet on the XDCR2 sense tube under the clamp (35). Put the clamp (46), the clamp (45) and the clamp (35) on the PU1-0012Tape, Thermosetting that you installed in step 4.A.(4)(c)5_. Tighten the clamp on the insulation cover (40) and the clamps (46), (45) and (35) with your hand until they hold the insulation cover (40) tightly.
       5 Fill the space between the insulation cover (40) and the link assembly (10) with the Sealant (Material No.PU3-0013) . Refer to the instructions of the manufacturer.
       6 Make sure that the Sealant (Material No.PU3-0013) fully cures before the aircraft flies. Refer to the instructions of the manufacturer for cure times.
     (y) Safety the pieces of the insulation cover (40) together with PU1-0002Cable, Safety.
     (z) Install the insulation cover (28) on the middle NAI duct (15) and forward NAI duct (26). Use the two clamps (27). Put the two clamps (27) on the PU1-0012Tape, Thermosetting that you installed in step 4.A.(4)(c)1_. Tighten the clamps (27) until they hold the covers tightly. Do not tighten them too much.
     (aa) Safety the pieces of the insulation cover (28) together with PU1-0002Cable, Safety.
   (16) Put the ignition cables in the middle NAI duct (15) spring clips.