Install - TB-1-1520-237-20-2130004

TB 1-1520-237-20-213

(5) Loosen, but do not disconnect fuel hose where it connects to the check valve (P/N

70307-03043-101).

(6) Disconnect fuel hose from crossfeed breakaway valve and use an appropriate container

to catch fuel.

(7) Plug hose and discard packing.

(8) Remove nuts, washers, cross feed beakaway valve, and gasket from fuel selector valve.

b. Install: Use this Procedure in lieu of the installation procedure provided in TM 1-1520-237-23,

paragraph 10-4-26.2 or TM 1-1520-250-23, paragraph 10.4.11.2.

CAUTION

Under no circumstances is a breakaway valve previously installed on the number

two crossfeed fuel line (right side) of an aircraft to be installed on a different

aircraft or be re-installed on the left side (crossfeed line number one).

(1) Turn off all electrical power.

(2) Install gasket on crossfeed breakaway valve.

NOTE

The crossfeed breakaway valve should rotate freely on the fuel selector valve.

(3) Install crossfeed breakaway on fuel selector value with washers and nuts, but only tighten

nuts finger tight at this time.

(4) Lubricate packing with petrolatum (FED SPEC W-P-236, NSN 9150-00-250-0926).

(5) Install packing on crossfeed breakaway valve.

(6) Unplug and connect fuel hose to crossfeed breakaway valve. Tighten fitting hand tight.

NOTE

Allow crossfeed breakaway valve and fuel hose to rotate freely on fuel

selector valve. Valve and hose should assume a neutral position which

will eliminate/reduce preload condition on the breakaway valve.

NOTE

While performing steps 7 through 9, avoid preloading crossfeed

breakaway valve while tightening couplings and hardware. Avoid

changing breakaway valve positions/orientation during the remainder of

the installation process.

(7) Tighten and torque B-nut on check valve end of fuel hose to 460-500 inch pounds.

(8) Torque nuts on crossfeed breakaway valve at fuel selector valve to 43-47 inch-pounds.

Avoid changing breakaway valve position/orientation.

(9) Adjust clamps where left and right side fuel hoses cross and retighten. (no torque valve).

(10)

If the oil cooler lines were clamped to the fuel hose. Secure them to prevent chafing.