TM 5-4220-227-14
5-32. Back Pressure Regulators.
This task covers:
Replace
INITIAL SETUP:
Tools
Equipment Condition
General Mechanic's Tool Kit
Chamber shut down (para. 2-15).
(NSN 5180-00-177-7033)
Materials/Parts
Back Pressure Regulator
Bands, Rubber (Item 4, Appendix E)
Bags, Plastic (Item 3, Appendix E)
Tape, Teflon (Item 21, Appendix E)
Replace. (figure 5-51)
WARNING
To prevent the spread of disease, serious injury and/or death, oxygen breathing systems
must be maintained hygienically clean and free from dust, dirt, and all hydrocarbon
contamination. Refer to oxygen system prework procedures para. 4-10 to avoid violating
this warning
CAUTION
Use two wrenches to remove and install all piping components to avoid damage.
NOTE
Ensure system is depressurized prior to beginning this task.
Gain access to OBR-022 the exhaust O2 regulator from the I/L, and OBR-023 the exhaust O2
regulator from the O/L by reaching under the bottom of and up behind the instrument panel.
OBR-022 must be removed first to gain access to OBR-023. Replacement of OBR-023 is
the same as OBR-022.
(1) Unlatch two latches (1), open enclosure door (2) and install two supports (3) and pins (4).
(2) Loosen fitting nut (5) and remove line (6).
(3) Loosen two fitting nuts (7) and remove two lines (8) and (9).
5-106
