(b)
Used Cells: Inspectcells removed fromairframecavity for repair, orbeingreturnedto service forcuts,abraded (scuffed) areas,andaccessorydamageoninsideandoutsideof cell surface. Reachthroughfuelcellaccessplateandtakesectionof cell between thumbandforefinger.WiperidgewithclothsoakedwithMethylethylketone.
If fine cracks are found,fuel cell isnot repairableand must be replaced.
(c)
BaffledFuelCells: Conduct the following inspectionevery2 yearsor after 2000hours in service,whichevercomesfirst:
(1.) Defuelbothmaincells. (2.) Removeaccessplateslocatedinboardofnacelle.Removebothwing and fuelcellaccess plates.
(3.) Inspectfuelcellfittings for rubberdeteriorationbyusing fingernail to attempt scrapingrubberoffmetal or nipplefitting. Ifrubberis not deteriorated, fingernailwill glide across rubber.Ifdeterioration, willdig into rubber.Deterioratedrubberusuallychanges
fingernail
fromlightyellowishtanto dark, reddishbrowncolor. (4.) Checktensionandknotsoftwonylonsupportcords. (5.) Inspectinteriorof cell for baffle securityandproper operation offlappervalve. Inspect
bothsides of baffle. (6.) Inspectexteriorof cells to ensure Velcrotapehasnot separated fromcellor liner surfaces. (7.) Installall access platesonfuelcellsandwings.Fillcellsand check forleaks.
NOTE: Referto 28-10-00Repairof Fuel Cellsfor fuel cellrepair procedures.
12.Cleaningof Fuel Cells
(a)
NewCells:New cells need notbecleanedafterremovalfromcontainers,if promptlyinstalled in airframe cavities.Ifcellsare not installed immediatelyandbecome dirty, cleanwithsoapandwarmwaterprior to installationin clean cavity.
(b)
Used Cells: Prior to removal,drainfuelfrom cells, purge withfreshair, and swabout to remove all traces offuel. Followingremoval,cleancellsinsideand out with soap andwater.
EFFECTIVITY:
PAGE14 040-999
Jan 10/90 28-10-00
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. Storage(continued)
13. 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.
14.Handlingof Repair Materials
CAUTION: REPAIRCEMENT FOR HEAT AND AIR CURE REPAIRS (5923C) AND QUICK CURE REPAIRS (82C32)REQUIRES THOROUGH MIXINGTO OBTAIN FULL ADHESIVE VALUES.
CAUTION: 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.
EFFECTIVITY:
28-10-00PAGE
15
Jan 10/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Storage (continued)
15. RepairLimitationsof Fuel Cells
NOTE:FT -227 fabric is used to repairsimplecontoursonly.All patches referredto in repair proceduresareof this type
(a)Lapinside patches overdefectiveedges1.0inch minimum in each direction.
(b)Cut outside patchesapproximately0.25to 0.50 inchlarger than insidepatches.
(c) Apply outside patchesand allow to cure before applyinginsidepatches
(d)Applyboth outside andInside patches for blisters between inner liner and fabric larger than
0.25inchin diameter.
(e)Applyboth outside and insidepatchesto rerair holesand punctures. Apply both outsideand insidepatchesto repairseperationsbetweenouterplies larger than1.0inchesin diameter.
NOTE:Slitsor tears are limited to 6.0 inches maximumin length.
(f) Applyoutsidepatchonlyto external abradedor scuffed areaswithoutfabricdamage.
(g)Trimloose laps as necessary provideda 5.0 inch effective band remains.
°
CAUTION: FOR EACH10 DROP IN TEMPERATUREFROM70°F,ADD 20 HOURSCURE TIME. DO NOT AIR CURE REPAIRSBELOW 60°F.
(h)Clamp repair patcheswhenperformingair cure repair.Cureat room temperatureof 70°F undisturbedfor72 hours.
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