OPTICAL TRAMMELING KIT 7HEL056

TM 55-4920-201-14

3-35. OPTICAL TRAMMELING

KIT

3-40. MAIN ROTOR BALANCING ADAPT-

7HEL056. (See figure 1-21.)

ER KIT 7HEL354. (See figure 1-26.)

Release the trunk-type latches and raise the

Opening the hinged cover after releasing

hinged top cover to provide access to the kit

bunk-type latches, reveals a plug assembly, sleeve

components. Identify parts by means of the

and a bushing as one complete assembly recessed in

packing layout. Particular care shall he exercised in

the storage cane cradle. All puts are precision

removing and handling the scope assemblies. Avoid

machined and the plug assembly is precision

dropping or otherwise damaging the scopes), scope

balanced also. Burrs, raised edges, sharp nicks,

support assembly or the target assembly. Do not

etc., are particularly undesirable and shall be

immerse the optical trammeling scopes in solvent or

avoided by careful handling of parts.

any other fluid.

NOTE

3-36. MAIN ROTOR BALANCING

KIT

A cool, dry, safe storage area shall be

7HELO61. (See figure 1-22.)

provided for storing all kit storage cases to

The gage, yoke assembly and adapter are

minimize damage and deterioration of

easily removed from their recesses in the kit storage

cases and parts.

case once the latches are released and the binged

3-41. DEPRESERVATION.

cover is raid. Handle kit details carefully so as to

WARNING

protect them from surface damage that would

Cleaning may be toxic. Use in well-

prove to he detrimental. The yoke assembly and

ventilated area. Avoid prolonged inhala-

adapter are precision balanced at the factory and

tion of fumes or direct contact with skin.

disturbance of this balance shall be avoided.

Do not use solvent near open flame or in

3-37. TAIL ROTOR BALANCE POSITIONING

area where very high temperatures prevail.

KIT 7HEL065 AND AA4920-8503. (See figure 1-23

and figure 1-23A).

3-42. Prior to shipment by the manufacturer, all

Opening the hinged cover, after releasing the

areas of kit components susceptible to corrosive

trunk-top latches, reveals eleven sets of matched

attack are carefully cleaned and then coated with a

bar pairs and two post assemblies. A decal strip,

Specified soft-film preservative compound in ac-

packing layout, and electric etched serial num-

cordance with specifications. The applied

bers on the parts identify the respective bar

preservative material is readily removed by

pairs. DO not interchange bars. Keep them in

washing the parts in clean mineral spirit solvent,

matched pairs (by serial number) and always re-

Federal Specification P-D-680, and wiping with

turn them to their proper part number slot in the

clean lint-free cloths or cleanring paper tissues.

attache-type storage case. Avoid any damage to

the bars, especially to the precision machined

Avoid fingerprint stains by handling parts with

ends.

clean, lint-free cloths after the thorough cleaning.

3-38. MAIN ROTOR HUB BALANCING KIT

CAUTION

7HELO66. (See figure 1-24.)

Immersion of detail parts in a vapor

By releasing the trunk-type latcher and raising

degreaser or heated cleaning solvents is

the hinged top cover, accessibility is gained to the

not recommended, since nonmetallic

components of this kit. The yoke assembly and

assembly details may be adversely

adapter are factory balanced and precision

affected. Never immerse balancing

machined. Handle parts carefully to protect them

arbors in a vapor degreaser or heated

from nicks, burrs and other detrimental surface

cleaning solvents, since arbor's internal

damage. Return parts to storage case when not in

assembly may be adversely affected and

me.

do not immerse the dial indicator

3-39. MAIN AND TAIL ROTOR HUB AND

(7HEL055 kit) or the optical tram-

BLADE BALANCING ADAPTER KIT

meling scopes (7HELO56, kit) in

7HEL069. (See figure 1-25).

cleaning solvents or other fluids.

Releasing the trunk-type latcher and opening

3-43. Following depreservation, if parts are to be

the hinged top cover, exposes the contents of thin kit

used in a balance application, leave them dry and

consisting of a yoke assembly, lock assemblies,

clean. If parts are not to be used immediately,

spacers and adapters. All parts are precision

apply a light film of preservative oil, Specification

finished and the yoke assembly also is factory

MIL-L-6085 to steel surfaces; particularly to

balanced. In handling parts, care shall be taken to

unplated piloting surfaces. Minimize parts han-

protect them from surface damage. Parts shall be

dling. Prior to actual usage, wipe dry and clean the

retained in the storage case to avoid loss or damage.

mated parts.

3-12 Change 1