NOTE: LEAKAGE RATES IN DROPS PER MINUTE ARE BASED ON APPROXIMATELY 20 DROPS PER CUBIC CENTIMETER (CC). FURTHER INVESTIGATION IS RECOMMENDED DURING AN ENGINE RUN WHEN THRESHOLD LIMIT IS EXCEEDED.
Rear Drain System Inspection
Figure 604 (Sheet 4)
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NO. DRAIN 1,2 BOX (STRUT) SERVICE DISCONNECT LEFT AND RIGHT DRAIN/SOURCE FLUID FUEL NONE ALLOWED ALLOWABLE LEAKAGE LIMIT SERVICABLE LIMIT THRESHOLD REQUIRED. FITTINGS IN STRUT AS REPAIR/REPLACE TUBING/ CORRECTIVE ACTION
(STRUT) DRAIN DISCONNECT BOX 2. RIGHT SERVICE
SEE A
FWD
1. LEFT SERVICE DISCONNECT BOX (STRUT) DRAIN
A
Service Disconnect Box (Strut) Drain Inspection
Figure 605
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D. Visual inspection for leakage
S 216-002-C00
(1)
Examine the aft sump and the ramp area below the aft sump, immediately after the engine shutdown for evidence of oil leakage (Fig. 601).
S 216-003-C00
(2)
Examine the underside of fan cowl panels and ramp area for leakage near the forward drain hole scupper and starter air discharge duct fitting (Fig. 602).
(a)
Look for fluid puddles on the ramp.
(b)
Look for fluid dripping from the forward drain hole scupper.
(c)
Look for fluid dripping from the duct fitting for the starter air discharge.
S 016-004-C00
(3)
If you see fluid leakage, open the fan cowl panels
(AMM 71-11-02/201).
S 216-005-C00
(4)
Look for wet drain tubes to find the leakage source.
(a)
Identify the drain tubes for the front drain system (Fig. 603)
(b)
Identify the drain tubes for the rear drain system (Fig. 604).
(c)
Identify the drain tubes for the service disconnect box (strut) drains (Fig. 605).
S 216-008-C00
(5)
For each drain tube that you think is the leakage source, find the leakage rate(s).
S 216-009-C00
(6)
Compare the leakage rate(s) to the allowable leakage rates in the tables (Fig. 601, 603, 604, and 605).
(a)
If the leakage amount is between zero and threshold limit, no action is necessary.
(b)
If the measured leakage rate is more than the serviceable limit for the allowable leakage rate, do a corrective action.
(c)
If the leakage amount is between the threshold limits and the serviceable limits, an engine run is recommended to find the fluid type, the leakage source and a more accurate leakage rate.
NOTE: Oil puddling in the exhaust must be considered as
____ normal as long as oil consumption rate is within serviceable limits.
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