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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
BOLT CLAMP
NUT
FWD
OIL SCAVENGE
TUBE (LR21)
J
L-B2787 (0000)
CLAMP
OIL TUBE OIL SCAVENGE
(LP48) TUBE (LR21)
FWD BOLT
K
NUT
FWD
OIL TUBE (LP48)
CLAMP
OIL SCAVENGE
TUBE (LR21)
BOLT
L
L-B2788 (0000)
Test 12 - Engines with PW SB 79-76
Figure 510B (Sheet 4)
G86385
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
TEST NO. 12 - ENGINE VACUUM TEST________________________________
(b) Remove the clamps on the oil scavenge tube (LR22) (Fig. 510B,
Views C, D, E and F).
(c) Remove the oil scavenge tube (LR22) from the oil scavenge tube
(LR21) and the port for the internal tube on the exhaust case
(Fig. 510B, Views B and G).
(d) Remove the clamps, nuts and bolts that attach the oil scavenge
tube (LR21) (Fig. 510B, Views H, J, K and L).
(e) Remove the oil scavenge tube (LR21) from the oil scavenge tube
(LR05) (Fig. 510B, View I).
S 495-215-N00
(10)
Install the PWA 85843 adapter to the internal tube nut on the exhaust case at the 10 o'clock position.
S 435-217-N00
(11)
Install caps on all oil supply tubes, breather tubes, and scavenge tubes.
NOTE: During the vacuum test, all of the oil supply tubes,
____ breather tubes, and scavenge tubes must be installed unless specified.
S 435-227-N00
(12)
If the integrated drive generator (IDG) or the hydraulic pump are removed, install the protection cover(s) on the gearbox pad(s).
S 495-216-N00
(13)
Attach the vacuum hose and the pressure line hose from the CTE 6075 Vaccum Cart to the PWA 85843 (Tee) Adapter.
S 795-228-N00
(14)
For this test, set the vacuum cart pressure at the ambient pressure (PAMB) minus 10 psi (69 kPa) or PAMB minus 20 inches (508 mm) Hg.
NOTE: At sea level, this is 5.0 psia (34.5 kPa ABSOLUTE).
____
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TEST NO. 12 - ENGINE VACUUM TEST
________________________________
S 795-249-N00
(15) Find the airflow leakage rate in the No. 4 bearing compartment.
(a) Make sure the airflow leakage rate in the No. 4 bearing compartment is not more than a maximum of 10 pounds/hour (4.5 kg/hour).
S 095-218-N00
(16)
Disconnect the vacuum cart hoses and remove the PWA 85843 Adapter from the internal tube nut.
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