CSP–520N–1
MD 520N (500N) ROTORCRAFT FLIGHT MANUAL
R
Revision 2
7–17
FAA Approved
NOTE
:
On transmission input gear oil seals with less that 2 hours of operation, some
seepage or wetting of adjacent surfaces is normal until seal is wetted and
worn–in (seated). If seepage continues at rate of one drop per minute or less,
seal may be continued in service. Check transmission oil level and observe
seepage rate after every 2 hours of operation. Shorter inspection periods may
be required if seal leakage appears to be increasing.
Engine oil leaks:
Refer to engine operating and maintenance manual for definition of permis(
sible engine oil leakage.
Landing gear damper hydraulic fluid leaks:
Hydraulic fluid leakage from any landing gear dampers is not permissible.
If leakage is present, damper assembly should be overhauled as required
and a serviceable unit installed. If leaking landing damper is not replaced
when leakage is noticed, continuation of damper in service can cause inter(
nal damage that might not otherwise occur.
NOTE
:
It is normal for a thin hydraulic oil film to remain on damper piston as a result of
wiping contact with piston seal. Newly installed dampers may also have slight
oil seepage from oil trapped in end cap threads during damper assembly. Neither
of these should be considered damper leakage or cause from damper
replacement.
7–16. PRESERVATION AND STORAGE
A helicopter placed in storage or nonoperative status must have adequate in(
spection, maintenance and preservation to avoid unnecessary deterioration of
airframe and components or equipment.
Extent of preventive maintenance that is to be performed on the helicopter for
storage up to 45 days, storage up to 6 months, and indefinite storage is cov(
ered in the HMI.
7–17. FLYABLE STORAGE – NO TIME LIMIT
Inspection before storage:
Perform Daily Preflight Check (Ref. Section IV).
Ensure that fuel cells are full (topped off), and that oil in engine oil tank
and main and aft transmissions is at FULL level.
Storage:
To maintain a flyable storage condition, ground runup must be performed at
least once every 5 days.
Perform daily preflight check.
