SPECIAL PROVISIONS TO MESSAGE REQUIREMENTS (AIRCRAFT).

TB 1-1520-240-20-163

b. Retail Stock. (Installation level and below) Submit Task/Inspection Compliance report for this message to

LOG POC NLT 26 Jan 06.

c. Wholesale Stock. (Including Depot Stock, Depot Maintenance and Single Stock Fund) Report compliance

with this message IAW para 8 to Wholesale POC NLT 26 Jan 06.

6. SPECIAL PROVISIONS TO MESSAGE REQUIREMENTS (AIRCRAFT).

a. Aircraft in AVIM or Depot level maintenance Commanders, facility managers and contractors will not issue

aircraft until they are in compliance with this message.

Aircraft at Contractor Facility DD 250 aircraft will be in compliance with this message prior to departure.

Aircraft in Transit.

(1) Surface/Air Shipment and aircraft in Ferry Status/Away From Home Station comply with message re-

quirements within 14 days of arrival.

(2) Ferry status/aircraft away from home station Comply with message requirements 10 aircraft hours/14

days of arrival.

7. TECHNICAL PROCEDURES/INSTRUCTIONS.

NOTE

Supplemental information for this message can be viewed at (use lower case letters only)

"https://ams14.redstone.army.mil/safety/sof/pic/c47a0601.pdf". Adobe version 6 or higher is re-

quired to view the supplement. For a free download of the current version go to "www.adobe.com".

NOTE

There are varying nomenclatures used to identify the 4 hydraulic actuators that attach to the forward

and aft aircraft swashplates. For the purposes of this message, "UBA" will refer to the whole com-

ponent assembly (Forward Pivoting, Forward Swiveling, Aft Pivoting, or Aft Swiveling actuators),

and "servocylinder" will refer to either or both of the 2 servocylinders that are part of each UBA.

Prepare aircraft for safe ground maintenance.

b. Inspect all UBAs (4 ea) (Forward Pivoting, Forward Swiveling, Aft Pivoting, and Aft Swiveling) for proper

return port sizes. Inspection may be completed by determining the wrench size (SAE) required for the mating fluid

fitting nut. The return ports are part of the end caps and are located on the bottom of each servocylinder. Note that

inspection criteria for the Aft Swiveling UBA differs from the Forward Pivoting, Forward Swiveling and Aft Pivoting

UBAs. If any port size/wrench size is not as specified below, comply with requirements of para 7.c.

(1)

Inspection of the Forward Pivoting, Forward Swiveling and Aft Pivoting UBAs.

(a)

The forward end cap return port size is 1/2 inch and the wrench size is 1 inch.

(b)

The aft end cap return port size is 3/8 inch and the wrench size is 13/16 inch.

(2)

Inspection of the Aft Swiveling UBA.

(a)

The forward end cap return port size is 3/8 inch and the wrench size is 13/16 inch.

(b)

The aft end cap return port size is 1/2 inch and the wrench size is 1 inch.