TASK 47-21-00-700-805
4. NEADS - Negative Pressure Leak Check
A. General
(1) This task makes sure that the primary backflow prevention check valve operates correctly.
B. References
Reference Title
47-21-04-000-801 Primary Backflow Prevention Check Valve Removal (P/B 401)
C. Tools/Equipment
NOTE: When more than one tool part number is listed under the same "Reference" number, the
tools shown are alternates to each other within the same airplane series. Tool part numbers
that are replaced or non-procurable are preceded by "Opt:", which stands for Optional.
Reference Description
SPL-14094 Test Equipment, NEADS Negative Pressure Leak Check
737-600, -700, -800
Part #: C47001-72 Supplier: 81205
D. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station 727.00 - Left
134 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station 727.00 - Right
E. Prepare for the Leak Check
SUBTASK 47-21-00-020-008
(1) In the left main wheel well, on the rear spar of the center tank, at the flame arrestor, disconnect
the dielectric hose.
NOTE: Use caution to prevent damage to the threads on the flame arrestor and hose.
(a) Put a protective cover on the dielectric hose.
SUBTASK 47-21-00-480-009
(2) Connect one end of the hose assembly included with the test equipment, SPL-14094 to the
flame arrestor fitting.
(a) Tighten and torque the hose fitting to 252 in-lb (28 N·m) - 308 in-lb (35 N·m).
NOTE: Do not connect the other end of the hose assembly to the control box of the test
equipment, SPL-14094 until after the vacuum is fully adjusted.
F. NEADS Negative Pressure Leak Check
SUBTASK 47-21-00-790-016
WARNING
USE APPROVED SAFETY EQUIPMENT FOR EARS FOR ALL PERSONNEL
WHEN THEY ARE NEAR NOISE THAT IS MORE THAN 84 DBA. THIS WILL
PREVENT INJURIES TO THEIR EARS.
(1) On the control box of the test equipment, SPL-14094, do these steps:
(a) Set the EXHAUST valve to the CLOSED position.
(b) Set the VACUUM valve to the ON position.
(c) Set the AIR SUPPLY REGULATOR control to decrease to the lowest position.
(d) Set the VACUUM REGULATOR control to increase to the highest position.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-21-00
Page 609
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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