CSP−HMI−2
MD Helicopters, Inc
.
MAINTENANCE MANUAL
Page 6
Revision 39
04−00−00
FAA APPROVED
4. Retirement Index Number (RIN)
(1). A Retirement Index Number (RIN) is a
number that accounts for different
usage spectra in assigning the retire-
ment time for a component.
The RIN is calculated as the sum of an
adjustment factor times flight hours
plus another adjustment factor times
Torque Events.
When a component reaches 1,000,000
RIN’s, it has reached it’s maximum life
and is to be scrapped.
5. Torque Event (TE)
A Torque Event (TE) is defined as:
The transition to a hover from forward
flight.
Any external lift operation.
NOTE:
An external lift can either be on the car-
go hook, external hoist or in external bas-
kets.
For external lift operators, an external
load is recorded as two (2) TE’s (pick−
up and drop−off).
Hover taxi with no external load will
typically result in no TEs.
6. External Lift and Torque Event (TE)
Requirements
The 369D/E/F/FF − 500/600N helicopters are
multi−use helicopters. If the helicopter is used
primarily for external lifts or training flights
(high TE flights), there may be a reduction in
inspection intervals of some components.
For safe operation of the heli-
copter, TE’s must be recorded in
the Rotorcraft Log Book. Each external lift
will be recorded as two (2) TE’s.
(1). Determine the number of TE’s and
external lifts the helicopter accumu-
lates per hour of flight time.
(2). Record all TE’s in Rotorcraft Log Book
and continue to record all TE’s.
(3). Perform required TE inspections.
CAUTION
