COVER PLATE SPECIFICATIONS

TB 1-1520-238-20-136

8.1.1 Safe aircraft per procedures in TM 1-1520-238-23-3, paragraphs 5.

8.1.2 Follow TM procedures to remove, inspect and re-install the retention nut

8.1.3 Drive Plate installed without De-Ice Distribution.

8.1.3.1 Fabricate a temporary drive plate cover per specifications given in paragraph 9.1.

8.1.3.2 Enter a circle red x per paragraph 1.1.

8.1.3.3 Install the temporary cover plate (Figure 4) using the 8 bolts/washers and 4 screws per Figure 301

of TM 1-1520-238-23-P2 normally used to secure the drive plate cover and torque each to 20 inch-pounds

per paragraph 6. of TM 1-1520-238-23-4. Continue the maintenance steps in the TM, which includes the

limited test flight.

8.1.3.4 When the test flight is completed remove the cover plate and perform thee retention nut re-torque

called out in the TM.

8.1.3.5 Remove the conditions imposed by paragraph 1.1

8.1.4 Drive Plate installed with De-Ice Distribution.

8.1.4.1 Fabricate a temporary drive plate cover per specifications given in paragraph 9.1.

8.1.4.2 Enter a circle red x par paragraph 1.1.

8.1.4.3 Install the temporary cover plate (Figure 5) using the 6 nuts/washers per Figure 301 of TM

1-1520-238-23-P2 normally used to secure the ADS and torque to 20 inch-pounds per paragraph 6. of TM

1-1520-238-23-4. Continue the maintenance steps in the TM which includes the limited test flight.

8.1.4.4 When the test flight is completed remove the cover plate and perform the retention nut re-torque

called out in the TM.

8.1.4.5 Remove the conditions imposed by paragraph 1.1.

8.2. AH-64D Procedure.

8.2.1 Safe aircraft per procedures in IETM 1-1520-251-LONGBOW publications.

8.2.2 Follow IETM procedures to remove, inspect and reinstall the retention nut.

8.2.3 Drive Plate installed without Derotation Unit.

8.2.3.1 Fabricate a temporary drive plate cover per specifications given in paragraph 9.1

8.2.3.2 Enter a circle red x per paragraph 1.1.

8.2.3.3 Install the temporary cover plate (Figure 4) using the 8 bolts/washers and 4 screws called out in the

IETM (under Maint Transmission Lube System Installation/Drive Plate Cover -- Remove and Install) normally

used to secure the drive plate cover plate and torque each to 23 inch-pounds. Continue the maintenance

steps, which includes the limited test flight.

8.2.3.4 When the test flight is completed remove the cover plate and perform the retention nut re-torque

called out in the TM.

8.2.3.5 Remove the conditions imposed by paragraph 1.1.

8.3. Following the limited test flights, remove the main rotor drive plate covers and inspect for damage (none

allowed). Inspect all nuts, bolts, screws, and washers for damage before using to reinstall the ADS (A Model)

or Derotation unit (D Model). Replace any damaged items.

9. COVER PLATE SPECIFICATIONS.

9.1. Cover plate specifications are as follows:

Nomenclature

Material

Dimensions

Processes

Main Rotor Drive Plate

ASTM 1020 HR/CR

See Figure 3.

Paint cover plate using

Cover Plate, A and D

Steel or AL 7075

yellow primer, NSN

model A/C

8040-01-205-6819

De-Ice Distribution

ASTM 1020 HR/CR

See Figure 4.

Paint cover plate using

Cover Plate, A model

Steel or AL 7075

yellow primer, NSN

A/C only

8040-01-205-6819