EFD1000 Installation Manual
DOCUMENT # A-01-126-00 PAGE 221-225 Revision H
© Copyright 2009 Aspen Avionics Inc.
D.12 Removal and Replacement
This section provides instructions for removal and replacement of LRU’s that have been previously
installed in the aircraft. No special tools are required for the removal and replacement of any
system LRU’s. If an LRU is found to be defective it should be removed and returned to Aspen
Avionics for repair or replacement.
PFD Removal
Verify power is off. Carefully insert a flat blade screw driver into the locking mechanism on
the top center of the PFD. While gently prying pull back the top of the PFD and extract from
bracket. Remove nut securing braided ground strap to PFD. Remove pitot and static quick
connectors by pulling back outer spring loaded locking sleeve while unplugging
connectors. To remove 44 pin D-sub connector unscrew both jackscrews fully and pull
connector straight back.
PFD Replacement
Verify power is off. Install 44 pin D-sub connector and tighten jackscrews until connector
is fully seated. Install pitot and static lines to back of PFD by firmly pressing the fitting
until fully seated (pitot and static quick connectors are keyed and cannot be crossed).
Gently pull on connector to ensure proper connection. Connect braided bonding strap to
PFD with nut. Insert bottom of PFD into bracket and pivot top forward until it locks into
place on bracket.
Perform pitot and static leak check and verify the airspeed and altitude indications on the
EFD correspond to the values set on the pitot static test set.
Perform return to service test by verifying no sensors are flagged invalid and there are no
RED-X’s on display. Perform sonalert test in Section 10.6.11.
PFD Battery Replacement
PFD battery replacement must only be performed by a properly certified individual or
facility. Remove PFD from panel as above. Remove two screws on each end of the football
shaped cover plate on rear of the PFD. Unplug electrical connector and slide battery out of
PFD. Install new battery in PFD then connect battery plug. Replace cover plate and
tightened cover screws. Reinstall and test PFD as above.
ACU Removal
Verify power is off. Remove ACU by unscrewing the jackscrews of all three D-sub
connectors. Gently remove the connectors by pulling straight out. Remove the six (6) 6-32
mounting screws securing the ACU to the aircraft and remove unit from aircraft.
ACU Replacement
Verify power is off. Install ACU in mounting location and install six (6) 6-32 mounting
screws through holes in ACU mounting tabs. Install all three (3) D-sub connectors securing
each with the two jackscrews per connector.
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