28-10 Bladder Assembly (continued)
B. Installation
1. Refer to Figure 28-2. Dust exterior of G028-1 bladder assembly and F028-1 support
assembly floor with talcum powder to facilitate bladder slippage along metal surface.
Do not allow powder to enter bladder.
2. Note locations of hook and loop tape on bladder lower surface and support floor.
Orient bladder, fold into thirds, place in center of support, and unfold into position.
3. Install screws and washers securing right roll-over vent valve to support. Fit A729-2
tube onto vent valve and install D277 clamp(s) or wrap tube with two turns 0.032-
inch diameter lockwire and safety tube to vent valve.
4. Install MS3367-7-9 ty-rap securing 35486 hanger tab to G915-5 tab. Cinch ty-rap
until snug without over-tightening, and trim tip flush with head.
NOTE
Verify bladder is free of wrinkles across lower surface and
properly located before attaching hook and loop tape. Bladder
may be pressurized with air to 1 psi max to assist installation.
CAUTION
Avoid contaminating bladder assembly interior. Cover arms with
sleeves and use lint-free gloves when working inside bladder.
5. Remove tape from bladder assembly openings. Insert a clean, smooth, blunt wooden
dowel through bladder service opening and press on bladder lower surface to attach
hook and loop tape. Verify security.
6. Install low-fuel switch assembly per § 28-22.
7. Install screws and washers securing bladder outlet to support. Lubricate new
MS29512-06 packing using A257-6 grease and install on B254-3 strainer. Install
strainer in bladder and special torque strainer per § 20-33.
8. Remove caps and connect D205-21 hose assembly to strainer. Special torque B-nut
per § 20-33 and torque stripe per Figure 5-1.
9. Install sump valve per § 28-12.
10. Lubricate new MS29513-270 packing using A257-6 grease and position within recess
around bladder service opening. Install F250-1 cover assembly and install hardware
securing cover to bladder and support. Verify security. Fit A729-40 tube onto left
roll-over vent valve and install D277 clamp(s) or wrap tube with two turns 0.032-inch
diameter lockwire and safety tube to vent valve.
11. Install fuel quantity sender per § 28-21.
12. Service helicopter with two gallons of fuel per § 12-41. Verify no leaks, especially
at bladder outlets. Install G004-4 (right side, aft fuselage) skin and install hardware
securing skin to cabin. Verify security.
13. Perform fuel flow check per § 28-40.
14. Install tailcone cowling assembly per § 53-23.
MAY 2015 Chapter 28 Fuel System Page 28.5
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