ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL
Rev.
8
MM-4-34
Sep
20/17
(5) After the pressure in the oleo has equalized to the regulator pressure, close the
oleo valve.
(6) Turn off the nitrogen tank and set the regulator pressure back to zero.
(7) Disconnect the service equipment and install the valve cap.
(8) (280FX) Slide the landing gear fairing into position and install the retaining
screws.
NOTE
On 280FX models, lower the flex boot, and install the screws securing the
flex boot to the oleo fairing.
(9) Remove the helicopter from the sling, as necessary.
4-21. Battery
(Figure 4-1, View S)
4-22. Servicing – Battery
A. Service the battery in accordance with manufacturer’s instructions.
4-23. Lubrication
4-24. Description – Lubrication
A. Lubrication of F-28/280 Series helicopters is normally accomplished at specified
hourly intervals. Operators should take into consideration the environmental conditions and
determine whether more frequent lubrication intervals are necessary. Refer to Tables 4-1 to 4-5
and Figure 4-1 for approved lubricants, intervals, and locations.
B. Purge lubricate all bearings and remove the excess grease before performing the
post maintenance ground run. Follow the procedures listed below for lubricating the lower
pulley (jackstrut), main rotor blade grips, main rotor flapping bearings, tail rotor pitch control
bearing, upper pulley (jackstrut) bearing, collective guide tube bearing, cyclic swashplate
bearing, and the idler pulley bearings.
C. Lubricate the flight control pivot points sparingly to prevent the accumulation of dirt.
4-25. Lower Pulley (Jackstrut) Bearing
(Figure 4-1, View H)
4-26. Lubrication – Lower Pulley (Jackstrut) Bearing
A. Remove the purge plug.
B. Purge lubricate the lower pulley bearing.
C. Reinstall the purge plug.
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