9-4B. Cleaning, Inspection And Repair Of Fuel Cells - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
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9-4b. CLEANING, INSPECTION AND REPAIR OF FUEL CELLS.
a. Fuel cells may be cleaned by the following procedure:
1. New Cells: It should not be necessary to clean new cells upon removing them
from their containers, if they are installed in the airframe cavities promptly. If for any
reason the cells are not installed immediately, and become dirty, they should be cleaned
with soap and warm water to remove foreign material prior to installation in a clean cavity.
2. Used Cells: Prior to removal, the cells are to be drained of fuel, purged with
fresh air and swabbed out to remove all traces of fuel. Following removal, the cells are to be
cleaned inside and out with soap and warm water.
WARNING
Use a vapor-proof light for inspection.
b. Fuel cells may be inspected by the following procedure:
1. New Cells: Inspect the cell surface inside and outside for cuts, abraded (scuffed)
areas and accessory damage. Also, inspect the fitting seals for nicks, scratches and foreign
material.
2. Used Cells: Cells removed from the airframe cavity for inspection and repair or
cells being returned to service from storage, should be inspected as outlined above.
Revised: 3/11/81
FUEL SYSTEM
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