JUL 2020 Chapter 28 Fuel System Page 28.5
28-10 Bladder Assembly (continued)
B. Installation (continued)
12. Service helicopter with minimum two gallons 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.
28-11 Rollover Valves
WARNING
Orientation of rollover valve balls is critical to valve operation.
The gold ball on top (earlier ball on top was blue) floats and
seals the vent in the event of inadvertent over-filling or in-flight
sloshing. The red ball on bottom presses the top ball against
the vent seat if the aircraft is inverted.
A. Packing Replacement and Valve Inspection
1. Remove tailcone cowling assembly per § 53-23, as required.
2. Refer to Figure 28-1. Remove D277-8 clamp(s) or cut and discard safety wire
securing A729 tube to rollover valve and pull tube off of valve.
3. Remove G254-2 fitting or G254-6 retainer. Remove and discard MS29512-10
packing (G254-2 fitting only) and A215-015 o-ring.
4. Carefully remove B208-5 and B208-6 balls using a suction cup attached to a
syringe. Inspect condition of balls, valve body, and fitting or retainer. Clean
parts and verify no nicks, scratches, gouges, dents, cracks, or corrosion.
5. Carefully install B208-6 ball (red, solid) on bottom and B208-5 ball (gold or blue,
hollow) on top in valve body using a suction cup attached to a syringe.
6. Install new A215-015 o-ring in groove inside fitting or retainer. Lubricate new
MS29512-10 packing using A257-6 grease and install over G254-2 fitting
threads.
7. Install fitting or retainer and special torque per § 20-33.
8. Secure A729 tube to valve using D277-8 clamp; verify security.
9. Install tailcone cowling assembly per § 53-23, as required.
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