ices. Very often it will be found that a particular procedure
does not apply to both scheduled maintenances. In order to
Table III. Organizational Mechanics or Maintenance Crews C and D
INSPECTION AND ROAD TEST
Note. When the tactical situation does not permit a full road
test, perform only those items that require little or no movement of
the semitrailer. When a road test can be made, it should be
approximately 3 miles but not over 5 miles.
Before operation: Tires, general visual inspection of
semitrailer and equipment. Perform the before-opera-
tion service (par.43).
Air pressure. With breaking systems of towing vehicle
and semi trailer proper] y connected, inspect for leaks
in the semitrailer air brake system by stopping the
engine when the air pressure is at a maximum and
noticing if there is any appreciable drop on the air
pressure gage within 1 minute.
Brakes braking effect, feel, side pull, noise, chatter,
p e d a l travel, and hand control. Apply semitrailer
brakes alone and observe if they operate effectively.
Disconnect hose from towing vehicle and see if semi-
trailer. brakes apply.
Unusual noises-attachments, body, and wheels. At all
times during the road test, be alert for unusual or
excessive noises that may indicate looseness, defects,
or dificient lubrication in these components.
Lamps-tail, clearance, stop, and blackout. During stops
in the road test, test the operation of these exterior
lights. Note condition of lights and safety reflectors.
AFTER ROAD TEST
T e m p e r a t u r e s - b r a k e drums, hubs. Immediately after
the road test, feel these units cautiously. An overheated
wheel hub and brake drum indicates an improperly
adjusted, defective, or dry wheel bearing, or a drag-
ging brake. An abnormally cool condition indicates
an inoperative brake.