TB 1-1520-238-20-66
Torque stripe on fastening hardware (mounting plate to SPAD Assembly).
Bent switch arms (roller arms).
Potting visible on one of the fasteners (nut/bolt) for the switch mounting plate (mounting
plate to SPAD Assembly).
Record the inspection results of these three factors on a separate DA Form 2404, and forward
a copy to your local ATCOM LAR or MDHC CFSR. Maintain one copy at the Unit location for each aircraft.
(9) Remove the SPAD Shear Pin from the SPAD Assembly (task 11.172, step b.). It is not
necessary to remove the Directional Push/Pull Rod. Retain the shear pin for later use.
(10) Allow the Mechanical Cam (spring loaded) to rotate, moving the roller-arms of the
microswitches activating (closing) the switches (normally open contacts).
CAUTION
Use only 22 AWG electrical contact pins (MS27493-22P) to perform the
following continuity check. Do not use safety wire or facsimile, or damage
to the DASE Plugs may result (spread contacts).
(11) Pull (open) the BUCS circuit/breaker located on the Pilot's center circuit breaker panel.
(12) Remove connectors P688, P686 and P682 from the DASE Computer (7-211D00005-
21/23). Locate pin 66 on P682, insert a electrical pin. Locate pins 125 (S1 ) and 126 (S2) on P688 (different
connector from CPG's inspection) - insert electrical pins.
(13) Check for continuity (multimeter) from pin 66 (common) on P682 to pin 125 (S1) and then
126 (S2) on P688.
(14) If continuity is present proceed to paragraph 8.c.(15). If it is not, proceed to paragraph
8.c(16).
(15) Rotate the SPAD Mechanical Cam from its present position, to the opposite side of the
Cam Stop (other direction). Re-check the function of the switches by performing paragraph 8.c(13).
(16) Failure of either/both switches is cause for rejection. Contact your local MDHC
representative for disposition instructions.
Pilot Lateral SPAD
(17) Visually inspect the switches for security using a flashlight and inspection mirror.
Reference paragraphs 8.c.(7) and 8.c.(8) for inspection criteria.
(18) Remove the SPAD Shear Pin I/A/W task 11.56, step a, retain the pin for later installation.
Allow the Mechanical Cam to rotate, closing the SPAD switches.
(19) Check for continuity from pin 66 (common) on P682 to pins 123 (S1 ) and then 124 (S2)
on P688 (aft avionics bay). If continuity is present rotate the Mechanical Cam in the other direction (opposite).
Recheck continuity (Pin 66 to 123 and then to 124).
(20) If continuity is not present refer to paragraph 8.c.(16) for corrective action.
Pilots Longitudinal SPAD
(21) Visually inspect the switches for security using a flashlight and inspection mirror. The
control arms of this SPAD may be removed manually to assist in viewing the switches (hidden). Reference
(22) Remove the SPAD Shear Pin I/A/W task 11.173 step c, retain the pin for later installation.
Allow the Mechanical Cam to rotate, closing the SPAD switches.
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