Page 28.6 Chapter 28 Fuel System JUL 2020
28-12 Sump Valve
A. Removal
1. Defuel helicopter per § 12-42.
2. Refer to Figure 28-1. Cut and discard safety wire (if installed) securing A729
tube to A761-2 or 1250H (sump) valve and remove tube.
3. Remove valve from G154-1 outlet assembly; tape bladder opening.
4. Actuate and lock valve to expose stem; remove and discard o-ring.
B. Installation
1. Actuate and lock A761-2 or 1250H (sump) valve to expose stem; install (new)
o-ring in stem seat.
2. Refer to Figure 28-1. Lightly coat valve threads using B270-6 sealant. Remove
tape and install valve in bladder outlet. Special torque A761-2 valve per § 20-33,
or standard torque 1250H valve per § 20-32, and torque stripe per Figure 5-1.
3. Secure A729 to valve stem. Note: safety wire is not required.
4. Service helicopter with minimum two gallons fuel per § 12-41. Verify no leaks.
To Next Page
