If it helps, here's a list of the stuff they asked us to do in the -107 dispositions:
1. Check elevator drum and bracket assembly for worn teeth and worn/splayed cable. Compare wear to the rudder and
aileron drum and bracket assembly. Replace if worn.
2. Run the following MBITs on the TOP per TO 1C-130H-2-22FI-10-3-5:
MBIT 01 - AC REFERENCE
MBIT 02 - ADS #1
MBIT 03 - ADS #2
MBIT 04 - Pilot ADI
MBIT 05 - Copilot ADI
MBIT 19 - Elevator Servo Hydraulics
MBIT 20 - Flight Control Panel
MBIT 28 - AFCP IBIT
3. Check the configuration pins on the back of the AP processor tray for broken or crossed wires.
4. Ensure the autopilot processor is seated in the mount correctly. The devices for holding the processor in place have a
clutch that is set to slip when the proper torque is reached.
5. Check all autopilot servo motors for like part numbers and manufacturer. It has been known to cause similar issues if they
6. Check all bonds/grounds on the autopilot processor and servos.
7. Replace Air Data Sensor. This was last done in Dec. 2007.
8. Check the elev. trim motor wiring and relays for possible issues. If it is a trim cycle problem the cuttler hammer relay should
be able to be heard cycling in the aft of the A/C over the cargo door. Only clicking you should hear under operation is when
the relay is being manually driven by the switches on the control wheel.
9. Check the elevator boost pack for physical mounting tightness. (It is believed that it would be noticed during all stages of
flight if the pack was loose but it may be being compensated for by pilots without knowledge.)
10. Replace elevator boost pack.
And the second one:
1. Have the flight crews reported instability of the ADI attitude indications while on the ground or during smooth level flight?
2. Check elevator rigging per procedures in 1C-130H-2-27JG-30-1.
3. Check elevator trim tab actuators (jackscrews). There have been reports of bolts seizing in the rod end that rotates.
4. Recheck all elevator servo to processor wiring. Check resistance of wiring, inspect TB105A for corrosion and loose wires, and CAREFULLY check all wiring for chaffing. Ensure there are no splices in these wires. Notes: there have been other aircraft that experienced similar autopilot problems traced to chaffing of this wiring. Splices were found a few years back in these wires above the right troop door on a Davis Monthan aircraft.
5. Swap suspect elevator servo on 64-14860 with the aileron or rudder servo on 64-14860. See if problem follows the suspect elevator servo.
6. If all items above check good then an alternate suggestion is to put the aircraft in flight mode using the TTU-205 Air Data Test. Override the weight-on-wheels, and set the TTU-205 to put the aircraft above 10,000 feet and 250 knots indicated airspeed.
a. Set the elevator trim tab to 0 degrees
b. Pull the yoke midway through the travel range
c. Engage the autopilot
d. Let the yoke go until it stops moving
e. Watch the trim tab indicator for either continuous movement or pulsed movement. What we are attempting to see is if the trim tab command is pulsing above 220 knots as designed.
f. Set the TTU-205 to different airspeeds and altitudes and attempt to duplicate the autopilot porpoising problem
At 250 knots the trim tabs should show a pulsed movement, if it's running continuously it more than likely indicates a problem in what the Air Data Sensor is reporting to the Autopilot. That could indicate a bad ADS or possible problem in the pitot system.
7. Using the TTU-205 as described in step 6 above, set the TTU-205 to different airspeeds and altitudes and attempt to duplicate the autopilot porpoising problem
8. Replace elevator boost pack. Realize this was performed during the first week of March 2010, but there have been incidences of 2 or more boost pack replacements required to correct autopilot porpoising.
Sorry about the formatting issues--I was copy/pasting from the -107s.