UNIT MAINTENANCE INSTRUCTIONS
IMPROVED RIBBON BRIDGE (IRB)
RAMP BAY M16
NSN 5420-01-470-5825 P/N 12478918;
INTERIOR BAY M17
NSN 5420-01-470-5824 P/N 12478919.
This lubrication instruction is for unit maintenance and provides the lubrication requirements needed to
support the Improved Ribbon Bridge (IRB). Included are Fluid Capacities, Lubricant Requirements,
Lubrication Intervals, and Locations for lubricating the bridge.
Service intervals are for normal operation of the bridge in moderate temperatures, humidity, and
atmospheric conditions. The intervals are hard-time intervals which are performed in accordance with the
bridges age, calendar time, or usage. The hard-time intervals are based on months of calendar times. An
example of calendar intervals is: semiannually (every 6 months), annually (every 12 months), or biannually
(every 24 months). The lubrication for the bridge is to be performed at whichever interval occurs.
For equipment under manufacturers warranty, hard-time fluid service intervals shall be followed. Hard-
time intervals may be shortened if lubricants are used under adverse conditions, including longer-than-
usual operation. Hard-time intervals may be extended during periods of low activity, although adequate
preservation precautions must be taken.
Lubricants are shown in table 3, and intervals and locations are shown in tables 1, 2, 4, and 5.
CORROSION PREVENTION AND CONTROL (CPC)
Corrosion prevention and control (CPC) of Army materiel is a continuing concern. It is important that
corrosion problems are reported so they can be corrected and improvements can be made to prevent future
While corrosion is typically associated with rusting of metals, it can also include deterioration of other
materials, such as rubber and plastic. Unusual cracking, softening, swelling, or breaking of these materials
may be a corrosion problem.
If a corrosion problem is identified, it can be reported using Standard Form 368, Product Quality
Deficiency Report. Use of key words such as corrosion, rust, deterioration, or cracking will ensure that the
information is identified as a CPC problem.
The form should be submitted to the address specified in DA Pam 738-750.
Filters shall be changed as applicable, when:
1. They are known to be contaminated or clogged.
2. Prescribed hard-time intervals are reached.