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Tank bleeding and defueling - Servicing
Figure 301A - OPTION H755 or OPTION H747
MAMA
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TANK VENTILATION
SERVICING
WARNING : OBEY THE SAFETY PRECAUTIONS DESCRIBED IN 28-00-00.
NOTE : This procedure is applicable to L.H. and R.H. installations. Information specific to R.H. installation are given in square brackets.
1. TANK VENTILATION
A. Tools and consumable materials
- Hose or sponge
- Syphon
- Blanking cap
- Compressed air source
B. Procedure
WARNING : APPLY THE FUEL TANK MAINTENANCE PROCEDURE - REFER TO 28-00-00.
1) Connect a ground cable from the aircraft to an approved ground terminal.
2) Disconnect the battery - refer to 24-30-02, and install the following warning sign :
WARNING
MAINTENANCE WORK IN PROGRESS
ON FUEL SYSTEM
DO NOT CONNECT
3) Defuel the tank in which the work is to be carried out - refer to 12-11-02.
4) Remove sealed inspection door 513 [613] - refer to 52-40-00.
5) Eliminate the fuel remaining in the non-drainable areas using a hose for suction or a sponge.
6) Make sure all the tools and materials are removed and the work area is clean and free from debris.
7) Temporarily install sealed inspection door 513 [613].
8) Remove inspection door 511 [611] - refer to 52-40-00.
9) Disconnect the fuel outlet pipe and blank off - refer to 28-20-03.
10) On the strainer end fitting, connect a hose connected to a syphon.
11) Open the filler cap and connect the syphon to a compressed air source.
12) Ventilate the tank until the fuel vapor concentration has dropped below explosion limit.
13) Carry out the work which required tank ventilation.
14) Close the filler cap.
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15) Make sure all the tools and materials are removed and the work area is clean and free from debris.
16) Remove the blanking cap and connect the fuel outlet pipe - refer to 28-20-03.
17) Install sealed inspection door 513 [613] - refer to 52-40-00.
18) Install inspection door 511 [611] - refer to 52-40-00.
19) Connect the battery - refer to 24-30-02, and remove the "WARNING" sign.
20) Disconnect the ground cable.
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DESCRIPTION AND OPERATION
1. GENERAL
This aircraft was delivered from the factory with a corrosion-preventive aircraft engine oil. If oil must be added during the first 50 hours, use only aviation grade pure mineral oil conforming to specification AIR 3560 D (MIL-L-6082).
　
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