Repair Of Fuel Cells; Handling Of Repair Materials - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
WARNING
Do not permit smoking or open flame near repairarea or cells.
b. When storing cells, observe the following rules.
1. Fold cells smoothly and lightly as possible with a minimum number of folds. Place protective
wadding between folds.
2. Wrap cell in moisture-proof paper and place it in a suitable container. Do not crowd cell in container,
use wadding to prevent movement.
3. Stack boxed cells to allow access to oldest cells first. Do not allow stacks to crush bottom boxes.
Leave cells in boxes until used.
4. Storage area must be dry and free of exposure to sunlight, dirt and damage.
5. Used cells must be cleaned with soap and warm water prior to storage. Dry, and box as outlined
above.
9-11.
REPAIR OF FUEL CELLS.
CAUTION
The repair of Loral vithane fuel cells should be restricted to
authorized personnel who have been certified and trained by Loral
representatives, or who have received their training from persons
who have been certified and trained by Loral representatives.
NOTE
The following repair procedures are in accordance with the cell
manufacturers repair procedure.
The following are recommended field repair procedures for fuel cells constructed of Loral BTC - 85 material.
Any of three methods may be used for repairs: heat cure, air cure, or quick cure. All repairs are neat and
permanent. Heat cure repairing allows cells to be cured and ready for installation in two hours. Air cure
repairing requires that the cell not be moved for 72 hours or longer. Quick cure repairing can be used on cells
that have minor damage and can be repaired in six hours.
9-12.
HANDLING OF REPAIR MATERIALS.
CAUTION
Repair cement for heat and air cure repairs (5923c) and quick cure
repairs (82c32) requires thorough mixing to obtain full adhesive
values.
All containers for cements and solvents should be properly identified.
a. Protect repair materials from dirt, contamination, sunlight, and excessive heat or cold during storage.
Containers are to be tightly capped and stored between 30°F and 85°F temperature.
b. Mix repair cements immediately before application.
c. Refer to each curing method for pot life of mixed cement.
NOTE
Unmixed repair cements have a shelf life designated by Loral on
the storage containers.
9-13.
REPAIR LIMITATIONS OF FUEL CELLS. Repair limitations are as follows:
NOTE
FT - 227 fabric is used to repair simple contours only. All patches
referred to in repair procedures are of this type
Revised: 2/18/94
FUEL SYSTEM
3B4