(b)
Use a ground air source or regulated dry plant air to pressurize the ejector.
NOTE: Disconnect the 3/4 " bleed air hose that goes down to
____ the right sidewall from the ejector at STA 1490 in the forward area of the aft cargo compartment. Connect the regulated plant air to the bleed air inlet of the ejector with an applicable connector.
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26-16-00
ALL ú ú 14 Page 523 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 975-085
(2) Use the hot wire anemometer and the adaptor and write the air velocity in zone 3 at each orifice in the aft compartment (8 locations).
-
(STA 1540, RBL 41.0) feet per minute
-
(STA 1540, LBL 44.0) feet per minute
-
(STA 1620, RBL 41.0) feet per minute
-
(STA 1620, LBL 44.0) feet per minute
-
(STA 1700, RBL 41.0) feet per minute
-
(STA 1700, LBL 44.0) feet per minute
-
(STA 1800, RBL 41.0) feet per minute
-
(STA 1800, LBL 44.0) feet per minute.
S 975-086
(3) Make sure the air velocity values are more than 150 feet per minute at each orifice.
NOTE: This step and the subsequent step make sure that each
____ sampling orifice in the zone does not have blockage. It also makes sure each sampling orifice has the correct dimension.
S 735-087
(4)
Make sure the maximum air velocity value in zone 3 is not more than 120 feet per minute more than the minimum air velocity value in zone 3.
S 975-088
(5)
Use the hot wire anemometer and the adaptor and write the air velocity in zone 4 at each orifice in the aft compartment (8 locations).
-
(STA 1860, RBL 41.0) feet per minute
-
(STA 1860, LBL 44.0) feet per minute
-
(STA 1940, LBL 38.0) feet per minute
-
(STA 1960, RBL 41.0) feet per minute
-
(STA 2040, RBL 36.0) feet per minute
-
(STA 2040, LBL 36.0) feet per minute
-
(STA 2125, RBL 36.0) feet per minute
-
(STA 2125, LBL 36.0) feet per minute.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
26-16-00
ALL ú ú 10 Page 524 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 975-089
(6)
Make sure the air velocity values are more than 150 feet per minute at each orifice.
S 735-090
(7)
Make sure the maximum air velocity value in zone 4 is not more than 120 feet per minute more than the minimum air velocity value in zone 4.
S 865-091
(8)
Release the pressure from the crossover duct or the alternative pressure source (AMM 36-00-00/201).
NOTE: If you used an alternative air source, remove the air source.
____ Connect the hoses at STA 1490. Torque the 3/4" ejector bleed air inlet (428 to 472 in. lb.) vand make a mark on it.
TASK 26-16-00-735-259
7. Vacuum Supply Tube Replacement Test
A. Do the following steps:
S 865-092
(1) Use one of the steps that follow to pressurize the ejector at STA 1490, WL 104, and BL 0 so that the pressure is between 15 and 50 psig:
(a)
Use the APU to pressurize the ejector.
(b)
Use a ground air source or regulated dry plant air to pressurize the ejector.
NOTE: Disconnect the 3/4 " bleed air hose that goes down to
____ the right sidewall from the ejector at STA 1490 in the forward area of the aft cargo compartment. Connect the regulated plant air to the bleed air inlet of the ejector with an applicable connector.
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