Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Rev. No:
Rev. Date:
Chapter:
Issue:
Issue Date:
Page:
Content:
20-AMM-75-02
3
06.11.2013
3
18
1
25.08.2014
(1)
Disconnect the hose from coolant radiator to ex-
pansion tank on tank side (expansion tank „IN“)
(2)
Plug the hose. Plug has to withstand a pressure
of 2.3 bar (33.3 psi).
(3)
Connect pump to expansion tank port
(4)
Disconnect the breather line and install a clear
hose. Fill clear hose partly with coolant liquid or
water.
(5)
Pressurize the tank up to relief pressure of the
cap, indicated by rising bubbles in the clear
hose.
(6)
Check if the relief pressure lies within following
limits for both cap orientations.
- Min. relief pressure: 1.8 bar (26.1 psi)
- Max. relief pressure: 2.3 bar (33.3 psi)
(7)
If relief pressure is out of limits the cap has to be
modified as follows (premature opening) resp.
replaced. See Figure 3.
- Bend up one of the 3 latches
- Remove the low portion of the cap
- Manufacture a shim washer made of brass
sheet.
(OD = 24mm, ID = 13mm, t = 0.3 - 0.5mm)
- Add shim washer and reassemble the cap
- Bend latches back
- Check relief pressure according to step 6
- If necessary add further shim washer until
relief pressure is correct adjusted
CAUTION:
Check proper fit of the coolant tank cap.
CAUTION:
The pressure must not exceed 2.7 bar (39.1 psi) during testing.
CAUTION:
Do not relieve pressure via opening the tank cap. Use pressure
relief unit on pump.
Summary of Contents for Cessna 172
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