TM 55-1520-240-23-4
5-67.2
REPAIR BLADE FAIRING SKIN DAMAGE
(Continued)
5-67.2
21.
Start vacuum pump. Check for leaks. Reposition
polyvinyl sheet (E284) (17) or add tape (E396)
(13) as needed.
22.
Maintain 20 inches Hg vacuum during adhesive
cure.
Do not exceed 160ºF (71ºC) at blade
surface. Damage to fiberglass can
occur.
23.
Cure adhesive at 140º - 160ºF (60º - 71ºC) 2
hours. Use heat lamp. Monitor temperature.
Use temperature indicating strips (E413).
NOTE
Serviceable cure can be achieved
without heat at 70º - 80ºF (21º -
27ºC) in 24 hours. Vacuum may be
removed after 12 hours.
24.
Turn off vacuum pump.
25.
Remove peel ply (9), fabric (10), rubber (11),
fiberglass (12), tape (13), tube (14), and sheet
(17).
26.
If squeezeout fairing is not satisfactory, fair patch.
Use adhesive (E40 or E41). Follow step 7 or 8
to mix adhesive.
INSPECT
27.
Find weight of repair. Use Adhesive Weight for
Single Skin Repairs table, record weight for blade
tracking weight adjustment.
NOTE
All blade repairs, weight adjustment,
painting, or balancing will be recorded
on rotor blade DA Form 2408-16,
each blade requires a separate form.
If the rotor blade does not have a DA
Form 2408-16, one must be prepared
and all actions recorded as example,
location of repair, size of repair,
weight of repair, and required weight
adjustments for track and balance.
5-348
