Maintenance Practices; General; Hard Landing; Sudden Stoppage - MD Helicopters MD Explorer Servicing And Maintenance

CONTINUED AIRWORTHINESS UNSCHEDULED INSPECTION

1. General

This section contains the unscheduled or
conditional inspections. You must do the
necessary Rotorcraft Maintenance Manual
(RMM) specific inspections and procedures
shown in the applicable table.
If there is an incident with your helicopter not
shown in this section, record all information
regarding the incident and speak to the Field
Service Department at MDHI, Mesa, Arizona.
Telephone 1-800-388-3378 or (480)
346-6387. DATAFAX: (480) 346-6813 for
inspections and maintenance procedures you
need to do.
It is possible you will need to do more than one
of the inspections or procedures shown in the
tables of this section. Do all inspections that
are applicable.
NOTE:
Refer to the applicable Pratt & Whitney
Canada (P&WC) maintenance manual (ref.
Section 01-00-00, Table 201) for necessary
inspections and procedures for conditions
equivalent to those shown in this section.
WARNING
D All components, assemblies, or parts
that are removed for overhaul or re­
pair must be identified with the
cause for removal.
D All other components, assemblies, or
parts that need to be replaced, must
be discarded.

2. Hard Landing

A hard landing is an incident or accident in
which the helicopter hits the ground with
sufficient force to cause:
D Main rotor blade to hit the tailboom or
upper fairings or cowlings.
MD Helicopters, Inc.
Rotorcraft Maintenance Manual

MAINTENANCE PRACTICES

D Permanent deformation of the landing gear
cross tubes more than permitted limits.
D The lower fuselage, lower tailboom surface,
or thruster to touch the ground.
Use the Level I inspection schedule in
Table 201 if you think there has been a hard
landing.
If you find damage or deformation when you
do the necessary maintenance and inspection
procedures, you must do the Level II inspec­
tion and procedure schedule in Table 202.

3. Sudden Stoppage

Sudden stoppage is a rapid deceleration of the
main rotor, rotor drive system, or anti-torque
fan.
A. Sudden Stoppage of the Main Rotor or
Rotor Drive System
Sudden stoppage of the main rotor and rotor
drive system is caused when the main rotor
blades hit the ground, water, snow, thick
vegetation, or other object of sufficient mass to
cause deceleration. Sudden stoppage of the
main rotor and rotor drive system can also
occur during a hard landing if the blades hit
the fuselage or the tailboom. Use the inspec­
tion schedule in Table 203 after a sudden
stoppage of the main rotor.
B. Sudden Stoppage of the Anti−Torque Fan
Sudden stoppage of the anti-torque fan is
when damage is sufficient to make it neces­
sary to replace the fan blades. Use the
inspection schedule in Table 204 after a
sudden stoppage of the anti-torque fan.
4. Overtorque
Overtorque is an incident in which the main
rotor, drive system, or anti-torque fan torque
loads are more than the permitted limits. Use
the inspection schedules in Table 205 thru
Table 210 when there has been an overtorque.
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CSP−900RMM−2
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