Correction Procedures

TB1--1520--251--20--05

b. Alternate APU removal procedure.--

NOTE

The removal procedure will utilize two CGU--1/B aircraft cargo tie downs looped around the

APU and the overhead hoist lifting hook to form a sling to prevent the APU from falling if

the lifting lug fails during removal.

(1) Prepare the APU for removal IAW the procedures in the IETM, (APU system, APU, removal

and install) up to the point of Connecting the lifting hook to the APU lifting lug.

(2) Attach APU cable sling to overhead hoist and position. Hoist over APU.

(3) Attach cable sling hooks to APU lift lug.

(4) Install the fwd aircraft cargo tie down P/N CGU--1/B.

CAUTION

Use caution during the removal and installation process to ensure the cargo straps remain

clear of all fuel lines and wire harnesses.

(a) Thread tie down strap around PTO clutch, ensuring the strap is aft of hard fuel line and

outboard of fuel solenoid and wire harness. Strap should lay in aft of the power takeoff (PTO) clutch.

(b) Connect the tie down strap to complete the loop and lay top of loop over the overhead

hoist lifting hook.

(5) Installation of the aft aircraft cargo tie down strap P/N CGU--1/B.

(a) Thread strap around the forward end of the APU combustion section case (just aft of the

fiberglass air inlet (plenum). The strap should be outboard of the clamp standoff and outboard of the igni-

ter cable and wire harness. The strap should be inside of the hard fuel line on the left side of the APU

plenum. Take special care that the strap is not putting stress on the fuel line.

(b) Connect the tie down strap to complete the loop and lay top of loop over the overhead

hoist lifting hook.

(6) Apply tension to the APU cable sling by raising the overhead hoist lift hook until there is no

slack in the cable sling.

(7) Remove slack from the forward and aft loops using the ratcheting mechanism provided.

Verify all straps are free of obstructions and are not putting stress on fuel lines or cable harnesses.

(8) Relieve weight of APU from APU mounts.

(9) Continue with APU removal IAW the IETM (APU system, APU remove and install).

c. Alternate APU installation procedures--

(1) Attach APU cable sling to overhead hoist and position hoist over APU.

(2) Attach cable sling hooks to APU lift lug.

(3) Install the forward aircraft tie down strap P/N CGU--1/B IAW paragraph 9b(4).

(4) Install the aft aircraft tie down strap P/N CGU--1/B IAW paragraph 9b(5).

(5) Apply tension to the APU cable sling by raising the overhead hoist lift hook until there is no

slack in the cable sling.

(6) Remove slack from the forward and aft loops using the ratcheting mechanism provided.

(7) Install APU into the aircraft IAW the IETM (APU System,. APU remove and install).

d. On or before 30 November 2002 -- replace the two piece welded lug with a one piece lug.