Manual Number 9019161
Revision A, September 9, 2020
9
SECTION 3
INSTALLATION PROCEDURES
GENERAL INFORMATION
IMPORTANT: READ THIS ENTIRE SECTION PRIOR TO STARTING INSTALLATION!
This section contains interconnect diagrams, mounting dimensions and other information pertaining
to the installation of the MD23 FLEX
Custom Function Display. After installation of cabling and
before installation of the equipment, ensure that power is applied only to the pins specified in the
interconnect diagram.
PARTS LIST
When unpacking this equipment, make a visual inspection and notify the sender if there is any
evidence that damage may have incurred during shipment. The following parts are included:
Item Description
MCIA Part Number
a. MD23 FLEX
Custom Function Display
6420023-( )
b. Installation Manual
9019161
c. Electrical Connector Kit
9019162-1
i. 26-pin d-sub
ii. Size 22 contacts/sockets
iii. Backshell kit, quick-disconnect
iv. (4) #6-32 mounting screws
d. Pneumatic Connector Kit *
9019162-2
v. Pneumatic Connector, quick-disconnect (2)
* pneumatic connector kit only included with the pitot/static version
CABLE HARNESS
Construct the cable harness in accordance with the instructions below, including the Connector
Pinout of Table 3.1 and Figure 3.1 and Harness Assembly per Figure 3.2. Installers should follow
industry-accepted practices regarding aircraft wiring and applicable regulatory requirements and
guidance. The instructions for constructing the cable harness as listed within this manual were also
used to construct the harness during environmental and electrical testing. Alterations may invalidate
environmental qualification and/or performance results.
Refer to Section 2.2 and 2.3 for planning unit location and cable routing guidelines.
3.3.1 WIRE GAUGE SELECTION
Wire gauge should be 22 AWG. Use of PTFE, ETFE, TFE, Teflon, or Tefzel insulated wire is
recommended for aircraft use per MIL-DTL-16878 or equivalent. Additionally, for data
signals associated with ARINC 429 inputs and outputs, all MIO signals, and RS-232,
shielded twisted pair wiring per M27500 or equivalent is recommended (and required to
meet the qualifications associated with the product certification.)
