WACO YMF F5 Series Maintenance Manual page 287

WACO Classic Aircraft Corp.
2850 Territorial Rd. West
Battle Creek, MI 49015
INSTRUCTIONS:
Released: 07/21/2010
Rev: IR
SERVICE BULLETIN
WACO CLASSIC CONSIDERS
COMPLIANCE MANDATORY
1. Determine if elevator cable tension is within safe limits. The simple test
described by Instruction 1(a) can be accomplished by the owner or pilot to make
a determination. A record of the test and the result is to be entered in the aircraft
records and signed by the person making the finding.
(a) With the stabilizer trim in the full nose down position, clamp the elevator in
the neutral position using small wooden blocks protected with foam or other
suitable material to prevent marring the paint finish as shown in Fig. 2.
(b) Using a rule as shown in Fig. 3, gently move the control stick fore and aft to
measure the amount of free play in the elevator control system taking care not to
apply so much pressure as to move the elevator or to dislodge the clamp. The
purpose is to determine if the cable system tension is adequate to prevent the
elevator cables from contacting the pulley guards on the Station 212 pulleys (Fig.
1). Any movement that can be determined to be in the stick socket or torque tube
linkage may be disregarded for the purpose of this test. If the free travel of the
stick is in excess of one half (1/2) inch, not including the aforementioned
movement, prior to further flight, compliance with Instruction 1(c) by a certified
mechanic is required. If the free travel is less than ½ inch, no additional action is
required prior to flight or before the next 100 Hr or Annual Inspection.
(c) If free travel exceeds that allowed by Instruction 1(b), the elevator cables
must be inspected as described in paragraph 2(a) of this instruction. If no defect
is found by inspection, set cable tension to 25 +/- 5 lbs and record compliance
with this instruction in the aircraft maintenance record. If the inspection finds
worn or frayed cables, installation of new cables (ref. Manual YMFAMM-1) and
compliance with Instruction #2 is required prior to further flight.
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Fig. 2
Fig. 3