(c)
Move the stabilizer until Dimension B on the stabilizer ballscrew actuator is 22.24 | 0.05 inch (564.9 | 1.2 mm) (2 units of trim on the position indicator) (Fig. 502).
(d)
Connect the breakout box to the neutral shift transducer that is attached to the upper feel unit arm (Refer to the "Neutral Shift Transducer Adjustment" topic for the applicable equipment).
(e)
Energize the transducer with 26 VAC, 400 Hz power.
(f)
Connect a phase angle voltmeter (PAV) across pins 3 and 5 on the breakout box.
(g)
Push the first officer's (upper) feel unit arm approximately 10 degrees clockwise (look from the top view).
(h)
Slowly permit the copilot's (upper) feel unit arm to turn back to the neutral position.
NOTE: Do not permit the upper arm to turn too quickly.
____
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MAINTENANCE MANUAL
(i) Write down the value shown on the voltmeter, and make a note of
the sign (positive or negative).
(j) Push the first officer's (upper) feel unit arm approximately
10-degrees counter-clockwise (look from the top view).
(k) Slowly permit the copilot's (upper) feel unit arm to turn back
to the neutral position.
NOTE: Do not permit the upper arm to turn too quickly.____
(l) Write down the value shown on the voltmeter, and make a note of
the sign (positive or negative).
(m) Calculate the average of the two values that you wrote from the
voltmeter, and make a record of this average value.
(n) Connect the first officer's (upper) feel unit control rod to
the crank arm on the aft quadrant.
(o) Make fine adjustments of the upper feel unit control rod, until
you can get the value shown on the voltmeter to agree with the
calculated average value, within +/-0.005 volts.
(p) Decrease the pressure in the auxiliary pitot systems No. 1 and
No. 2 to 0.0 psig (0.0 kPa) (AMM 34-11-00/201).
(q) Make sure that the transducer output voltage does not change by
more than 0.060 volts.
(r) If the transducer voltage changed by more than 0.060 volts,
adjust the upper control rod again, and repeat the steps to
make sure the control rod is adjusted correctly.
S 865-216
CAUTION: DO NOT LET THE PRESSURE GO ABOVE 4.75 PSI (32.8 KPA)
_______ (426 KNOTS). THIS WILL PREVENT DAMAGE TO THE FEEL COMPUTER. MAKE PRESSURE CHANGES SUCH THAT THE INDICATED RATE OF CLIMB (OR DESCENT) IS LESS THAN 5000 FEET PER MINUTE FOR THE STATIC SYSTEM AND 300 KNOTS PER MINUTE FOR THE PITOT SYSTEM. APPLICABLE GAUGE SAVER RESTRICTORS OR EQUIVALENT DEVICES MUST BE USED.
(6) Pressurize the auxiliary pitot systems No. 1 and No. 2 to 4.0 psig (28 kPa) (AMM 34-11-00/201).
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757 MAINTENANCE MANUAL
S 825-049
(7)
Do the adjustment for the neutral shift transducers (Refer to the Neutral Shift Transducer Adjustment paragraph).
I.
Neutral Shift Transducer Adjustment (Fig. 507)
NOTE: Five procedures to adjust the neutral shift transducers are given.
____
PROCEDURE 1 uses the A27063 equipment, a power supply, and a digital phase angle voltmeter (PAV). PROCEDURE 2 uses the A27063 equipment, airplane power, a digital voltmeter (DVM), and a ratiometric PAV.
PROCEDURE 3 is the same as PROCEDURE 2 except that the ratiometric PAV is replaced with a PAV and the ratio calculation is done manually.
PROCEDURE 4 uses a phase synchronous voltmeter. PROCEDURE 5 uses an MCDP Ground Test procedure.
S 865-050
(1)
Do these steps to prepare for the neutral shift transducer
adjustment:
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