Technical data

13773-001
71-20
Page 1
MOUNTS
1. DESCRIPTION
This section describes the framework which supports and attaches the engine to the airplane. Included are
the engine mount weldment and elastomeric vibration isolators.
The engine is attached to a welded tubular steel engine mount. The engine mount weldment is fastened to
the fuselage firewall at four points by steel bolts. Conventional elastomeric isolators are employed for
vibration dampening. At the engine mount points, oversized steel disks are attached on the opposite side
of the engine so that in the event of a fire, the disks will keep the engine fastened to the engine mount
weldment.
2. MAINTENANCE PRACTICES
A. Engine Mount Weldment (See Figure 71-201)
(1) Removal - Engine Mount Weldment
(a) Remove engine. (Refer to 71-00)
(b) Remove cockpit floor covering. (Refer to 25-10)
(c) Remove access panels CF1L and CF1R to gain access to engine mount weldment lower
attach points. (Refer to 6-00)
(d) Remove lower engine mount nuts, washers, and through-bolts.
(e) Remove glareshield. (Refer to 25-10)
(f) Ensure engine mount weldment is supported and remove upper engine mount nuts, wash-
ers, and through-bolts.
(g) Remove engine mount weldment from airplane.
(2) Installation - Engine Mount Weldment
(a) Ensure engine mount weldment is supported and aligned with mounting points on firewall.
(b) Install upper engine mount through-bolts, washers, and nuts. Torque to 38 to 40 foot-
pounds (4.18 to 4.4 Nm) adding torque value to overcome nut friction. (Refer to 20-60)
(c) Install lower engine mount through-bolts, washers, and nuts. Torque to 38 to 40 foot-
pounds (4.18 to 4.4 Nm) adding torque value to overcome nut friction. (Refer to 20-60)
(d) Install access panels CF1L and CF1R. (Refer to 6-00).
(e) Install cockpit floor covering. (Refer to 25-10)
(f) Install glareshield. (Refer to 25-10)
(g) Install engine. (Refer to 71-00)
B. Engine Mount Isolators (See Figure 71-201)
(1) Removal - Engine Mount Isolators
CAUTION: Place a tail stand of suitable capacity under tail of airplane before removing
engine.
(a) Remove cowling. (Refer to 71-10)
(b) Remove exhaust system. (Refer to 78-20)
(c) Attach hoist at forward and aft lifting points. Lift engine just enough to relieve weight from
engine mounts.
(d) Remove nuts, washers, heat shields, and bolts from engine mount attach points.
Note: Mark and note location of each isolator for reference upon reinstallation.
30 Nov 2000