The following items
are examples of the benefits operators have achieved by using
the component removal reduction (CRR) process.
Unit (LRU) Removals Reduced by Nearly 50 Percent
Within six months of implementing the CRR process, one operator
reduced LRU removals from 32 per month to 18 per month.
An inertial reference unit (IRU) was removed after less than
1,000 hr in service. A check of the records for this unit
showed that it had been installed five times in four years
and had never lasted more than two weeks in service after
each installation. The vendor exchanged the rogue unit for
a new one. Another operator using the CRR process encountered
a similar situation with an IRU from another vendor.
Investigation of multiple failures of one part number LRU
revealed that a free life-improvement modification had not
been performed. After the modification was implemented, the
LRU no longer showed up on the short-life unit list.
A repair shop reported that an electromechanical indicator
failed because of dry grease on the gear train. Inspection
of an airplane, which was parked at the maintenance ramp,
revealed that technicians had checked the lights in the cockpit
and had left the light controls on full bright. As a result,
the instrument panel was too hot to touch, and the extremely
high temperature caused the grease in the instruments to dry
out. The technicians were instructed to turn off the lights
after checking them, and the problem did not reoccur.
Several computers were found to have a short life (200 to
300 hr) after shop repair. Investigation revealed that the
vendor shop was not using correct electrostatic discharge-sensitive
protection on repaired units. After being alerted to this
issue, the vendor revised its shop practices and the life
of the computers returned to normal.