Inspection; Inspection Checklist; Airframe Maintenance; Airframe Sealing - Rockwell Commander 112 Maintenance Manual

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SECTION IT
SERVICING
MAINTENANCE MANUAL
ROCKWELL
COMMANDER
112/B/TC/TCA
AND INSPECTION
INSPECTION
To avoid repetition throughout an inspection, general
points to be checked are given in Figure 2-8. Only
the items to be inspected are listed and details as to
how to check, or what to check for, are excluded.
Details on how and what to check for are specified in
the appropriate sections of this manual. Some item s
are optional equipment that may not be found on a
particular airplane. Check FAA Airworthiness Direc-
tives and General Aviation Division Service Letters
for compliance at the time specified by them.
INSPECTION CHECKLIST
MOVABLE PARTS for: lubrication, servlCmg, secur-
ityof attachment, binding, excessive wear, safetying,
proper operation, proper adjustment, correct travel,
cracked fittings, security of hinges, defective bearing,
cleanliness, corrOSion, deformation, sealing and
tensions.
FLUID LINES AND HOSES for: leaks, cracks, dents,
kinks, chafing, proper radius, security, corrOSion,
deteriorations, obstructions and foreign matter.
METAL PARTS for: security of attachment, cracks,
metal distortion, broken spotwelds, corrOSion, con-
dition of paint and any other apparent damage.
WIRING for: security, chafing, burning, defective
insulation, loose or broken terminals, heat deterio-
ration and corroded terminals.
BOLTS IN CRITICAL AREAS for: correct torque in
accordance with the torque values given in the chart
or when visual inspection indicates the need for a
torque check.
FILTERS, SCREENS, AND FLUIDS for: cleanliness,
contamination and/or replacement at specified inter-
vals.
AIRFRAME MAINTENANCE
AIRFRAME SEALING
The airframe is sealed during manufacture of the
various subassemblies and again after airframe com-
pletion. The follOWing information is included to
assist in the maintenance and repair of the airframe
to obtain a correct and lasting seal when replacing
any structural parts.
SEALANT AND INSULATION MATERIALS. The
following is a list of sealants and insulation materials
to be used in the aircraft.
Products Research Co.
2-14
1005L Class B-1/2 (MIL-S-4383)
1221 Class A-1/2 (MIL-S-7502)
1221 Class A-2 (MIL-S-7502)
1403-G-B2
1422 Class A-1/2 (MIL-S-8802)
1422 Class A-2 (MIL-S-8802)
1422 Class B-2 (MIL-S-8802)
1422 Class B-4 (MIL-S-8802)
1435 Quick Repair Sealant
5000 White Sealer
Dow Corning Corp., RTV-732, 24 hour
Coast Pro-Seal 700, 72 hour, (MIL-S-38249, Type 1).
NOTE
Class A- indicates brushable material.
Class B- indicates filleting or injection
material. Dash numbers indicate work
life. Example: A-2 indicates a brush-
able material having a 2-hour maximum
work life.
Prior to use, all sealants are to be stored in a refrig-
erator. Two- part sealants should be mixed only in
the quantity required for a specific task. Surplus ad-
hesive should be discarded since the storage life of
mixed sealants, even under refrigeration, is very
limited. The two-part sealants have a definite and
limited work life after being mixed; the work life
being the length of time the sealant will remain in a
workable form before becoming too hard. Before
mixing the sealant, the amount needed for the specific
job should be estimated and only that amount mixed.
Do not try to seal an area so large that the job cannot
be finished within the work life, of sealants. By using
these simple precautions a great deal of time and
sealant may be saved.
CLEANING MATERIALS AND TOOLS. The following
is a list of cleaning materials and tools used when
applying sealants.
1. Methyl Ethyl Ketone (MEK).
2. Gauze sponges; Johnson and Johnson, Finetex,
Leshner industrial wipers, or equivalent.
3. Clean rags.
4. Pyles sealing gun, Model 250-06 (using dispos-
able cartridges).
5. Sealant forming tools-spatula and sealant fair-
ing tools.
6. Inspection mirror.
7. Solvent dispenser.
SEALING PROCEDURES. The following procedures
are provided to enable operators to obtain successful
sealing of the airframe during and following repairs.
Cleaning
Remove grease, oil, dirt, chips and all foreign ma-
terial prior to cleaning. The success of a good seal
depends on the thorough cleaning of both surfaces of
the affected parts to be sealed. Cleaning can be ac-
complished using expendable gauze sponges or a clean
lint-free cloth. Scrub both surfaces until cloth re-
mains clean after wiping. Do not use an excessive
amount of solvent. For the final cleaning, wipe sur-
faces dry with a clean dry cloth to remove any film
left by the evaporation of the solvent. The area cleaned
should be slightly wider than the width of the sealant
to be applied. All cleaning solvent should be removed
from assembly faying surfaces with oil-free, com-
pressed air. If any primer or paint is removed dur-
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