Mid-Continent Instruments MD41 Series Document technique

INSTALLATION MANUAL AND

OPERATING INSTRUCTIONS

MD41-( ) Series GPS ANNUNCIATION CONTROL UNIT

FOR ALLIED SIGNAL KLN 90B

MD41-328 28vdc Horizontal Mount

MD41-338 28vdc Vertical Mount (shown on page 13)

MD41-324 14vdc Horizontal Mount

MD41-334 14vdc Vertical Mount (shown on page 13)

MID-CONTINENT INST. CO., INC MANUAL NUMBER 7016074

REV. 4 Jan. 09, 1997 2

MANUAL REVISION AND HISTORY

MANUAL: MD41-324, -334, -328, -338

REVISION: OCT. 25, 1995 Rev. 1

MANUAL NUMBER: 7016074

This revision level of this manual consist of the following changes:

Add MD41-334, -338 vertical mount versions.

REVISION: NOV. 06, 1995 Rev. 2

Add MD41-328(5V)/338(5V) These part numbers have 5 volt push-button lighting.

REVISION: JAN. 24, 1996 Rev. 3

Added GPS annunciation interlock.

REVISION: JAN. 09, 1997 Rev. 4

Revised DO160C section 4.0 environmental test data. Test D1 is now F2

REV. 4 Jan. 09, 1997 3

TABLE OF CONTENTS

SECTION 1 GENERAL DESCRIPTION

1.1 INTRODUCTION

1.2 SPECIFICATIONS, TECHNICAL

1.2.1 PHYSICAL CHARACTERISTICS

1.2.2 ENVIRONMENTAL CHARACTERISTICS

1.2.3 SPECIFICATIONS, ELECTRICAL

1.2.4 FRONT PANEL CONTROLS AND ANNUNCIATIONS

1.2.4.1 CONTROLS

1.2.4.2 ANNUNCIATIONS

1.2.5 INTERFACE

1.2.6 EQUIPMENT LIMITATIONS

1.2.7 MAJOR COMPONENTS

SECTION 2 INSTALLATION CONSIDERATIONS

2.1 COOLING

2.2 EQUIPMENT LOCATION

2.3 ADDITIONAL ANNUNCIATIONS

2.4 ADDITIONAL RELAYS

2.5 ROUTING OF CABLES

SECTION 3 INSTALLATION PROCEDURE

3.1 GENERAL INFORMATION

3.2 UNPACKING AND INSPECTING

3.3 MOUNTING THE MD41-( )

3.4 INSTALLATION LIMITATIONS

SECTION 4 POST INSTALLATION CHECKOUT

4.1 PRE-INSTALLATION TEST

4.2 OPERATING INSTRUCTIONS

FIGURE N0. LIST OF ILLUSTRATIONS

3.1 SCHEMATIC PINOUT, 25 PIN DSUB

3.2 SCHEMATIC PINOUT, 50 PIN DSUB

3.3 CUTOUT DIMENSION FOR PANEL MOUNTING

3.4 OUTLINE DRAWING

3.5 WIRING DIAGRAM, MD41-324/334 (14V)

3.6 WIRING DIAGRAM, MD41-328/338/328(5V)/338(5V) (28V)

APPENDIX

ENVIRONMENTAL QUALIFICATION FORM

REV. 4 Jan. 09, 1997 4

SECTION 1 GENERAL DESCRIPTION

1.1 INTRODUCTION

The MD41-( ) is a self -contained GPS Annunciation and Control unit. It combines all the

necessary functions required for switching HSI/CDI data inputs between a conventional

NAV (VOR) receiver and the Allied Signal KLN 90B approach-certified GPS receiver. In

addition, the MD41-( ) contains several GPS status annunciations used to indicate modes

selected by the front panel switches and various inputs from the GPS receiver.

A special ILS override feature has been incorporated to cause the MD41-( ) to

automatically switch to the NAV mode when the NAV (VOR) receiver is tuned to an ILS

frequency. Other features include dual, 16,000 hour lamps used for all annunciations,

internally lighted selection switches, automatic photocell dimming, and built-in

annunciation self test. A external annunciation dimming adjustment is provided for

balancing low level light conditions.

A 19 pole relay assembly is included within the MD41-( ) to simplify installation of the

switching between NAV (VOR), GPS and the associated HSI/CDI. All relays have gold

plated contacts and are nitrogen filled for high reliability.

Two versions are available that will allow the lighted selection buttons to operate from a

5 volt instrument dimming bus. These part numbers are as follows: MD41-328(5V) and

MD41-338(5V).

A MD156 adapter plate is available for front mount installations. Also a MD155 punch is

available for instrument hole cutout.

1.2 SPECIFICATIONS, TECHNICAL

1.2.1 PHYSICAL CHARACTERISTICS

Mounting: Panel

Width: 3.50 Inches

Height: 1.350 Inches

Depth: 4.625 Inches

Weight: 0.75 lbs.

REV. 4 Jan. 09, 1997 5

1.2.2 ENVIRONMENTAL CHARACTERISTICS

TSO Compliance: TSO C129

Applicable Documents: RTCA DO-160C, DO-208

Operating Temperature Range: -55°C to +70°C

Humidity: 95% Non-Condensing

Altitude Range: 0 to 55,000 ft.

Vibration: Cat. M and N

Operational Shock: Rigid Mounting, 6 G Operational

15 G Crash Safety.

1.2.3 SPECIFICATIONS, ELECTRICAL

Design: All Solid State

MD41-324/334 (14VDC) 0.65 Amps

MD41-328/338 (28VDC) 0.40 Amps

MD41-328(5V)/338(5V) (28VDC) 0.40 Amps

Relay contact current rating 2 Amps DC

Available relay poles (SPDT) 19

1.2.4 FRONT PANEL CONTROLS AND ANNUNCIATIONS

1.2.4.1 CONTROLS

NAV/GPS Alternate action switch, when pressed, will select NAV

(VOR) or GPS presentation on HSI/CDI.

GPS/APR Momentary switch, when pressed, will arm GPS Approach

Mode.

OBS/LEG Alternate action switch, when pressed, will select between

OBS and LEG modes.

LAMP TEST Momentary switch for testing annunciation lamps. Note:

Screwdriver adjustable control located on right side of case

sets annunciator low dimming level.

1.2.4.2 ANNUNCIATIONS

NAV NAV (VOR) information presented on the HSI or CDI.

GPS GPS information presented on the HSI or CDI.

ARM GPS is armed for automatic transition to approach mode.

ACTV GPS is actively engaged in the approach mode.

REV. 4 Jan. 09, 1997 6

OBS This will activate the course selector and also disable

the automatic GPS waypoint sequencing to the next leg.

LEG This will disable the course selector input to the GPS

and will enable automatic GPS waypoint sequencing to the

next leg of the pre-planned route.

MSG GPS message alert, from the GPS receiver.

WPT GPS waypoint alert, from the GPS receiver .

1.2.5 INTERFACE

APPR ARM Select

J1 Pin 24

Provides a momentary logic low to GPS

receiver when approach arm is selected.

APPR ARM

J1 Pin 16

Receives a logic low from the GPS receiver to

annunciate ARM.

OBS/LEG Select

J1 Pin 9

Provides a logic low to the GPS receiver

when OBS is selected.

GPS APR ACTV

J1 Pin 8

Receives a logic low from the GPS receiver

when a transition is made from arm to active.

ILS Override

JI Pin 14

Receives a logic low from the NAV (VOR)

receiver when tuned to an ILS frequency.

This will force the MD41-( ) into NAV mode

regardless of the NAV/GPS selection. This

connection is optional.

AP ILS Energize

J1 Pin 3

Provides an ILS ground to the autopilot

computer. This AP ILS energize will follow

the MD41-( ) NAV/GPS selection. When in

GPS mode, a ground will appear on J1 pin 3

when ACTV is annunciated.

NAV Receiver ILS

J1 Pin 4

Receives an ILS energize input from the

NAV(VOR) receiver. This will provide an

ILS energize output to J1 pin 3 when NAV is

selected on the MD41-( ).

MSG and WPT

annunciation

A logic low will cause the appropriate

annunciation to illuminate. GPS receiver must

be able to accept 100ma.

GPS DISPLAYED

J1 pin 17

Provides a ground to the GPS receiver when

NAV is selected on the MD41-( ).

REV. 4 Jan. 09, 1997 7

1.2.6 EQUIPMENT LIMITATIONS

The MD41-( ) series control units contain specific dash numbers to be used with various GPS

receivers. The installer must match the correct controller part number with the GPS receiver

being installed.

The conditions and tests required for TSO approval of this article are minimum

performance standards. It is the responsibility of those desiring to install this article either

on or within a specific type or class of aircraft to determine that the aircraft installation

conditions are within the TSO standards. The article may be installed only if further

evaluation by the applicant documents an acceptable installation and is approved by the

Administrator.

The MD41-324/328/334/338/328(5V)/338(5V) is TSO’D and certified for use with the

Bendix/King KLN 90B system. Any attempts to install the

MD41-324/328/334/338/328(5V)/338(5V) in an installation other than the Bendix/King KLN

90B is prohibited. This will void the TSO.

NOTE: Anytime the MD41-( ) is disconnected or removed from the aircraft, the HSI/CDI

will be inoperative in both NAV (VOR) and GPS.

1.2.7 MAJOR COMPONENTS

The system is comprised of one major component, the MD41-( ) GPS Annunciation Control

Unit.

REV. 4 Jan. 09, 1997 8

SECTION 2 INSTALLATION CONSIDERATIONS

2.1 COOLING

No direct cooling is required. As with any electronic equipment, overall reliability may be

increased if the MD41-( ) is not located near any high heat source or crowded next to other

equipment. Means of providing a gentle air flow will be a plus.

2.2 EQUIPMENT LOCATION

The MD41-( ) must be mounted as close to the pilot’s field of view as possible. The preferable

location is near the HSI/CDI that will be displaying the GPS information. The unit depth, with

connector attached, must also be taken into consideration. A MD156 adapter plate is available

for front mounting.

2.3 ADDITIONAL ANNUNCIATIONS

Depending upon the installation and approving agency, you may be required to provide

additional NAV Source Select external annunciators near the HSI/CDI. Spare relay contacts

on the MD41-( ) J1 or J2 connector may be used for this purpose.

2.4 ADDITIONAL RELAYS

The MD41-( ) contains 19 relay poles. Some installations may require more than 19 poles due

to data lines, superflags etc. If this should occur, you may use one spare relay pole to switch

additional relays. In cases where it may be more desirable to have all the relay switching done

at a remote location, (i.e.: remote mounted equipment) one relay pole on the MD41-( ) may be

used for switching this bank of relays. Please note that the maximum relay contact rating for

the MD41-( ) is 2 amps DC.

2.5 ROUTING OF CABLES

Care must be taken not to bundle the MD41-( ) logic and low level signal lines with any high

energy sources. Examples of these sources include 400 HZ AC, Comm, DME, HF and

transponder transmitter coax. Always use shielded wire when shown on the installation print.

Avoid sharp bends in cabling and routing near aircraft control cables.

REV. 4 Jan. 09, 1997 9

SECTION 3 INSTALLATION PROCEDURES

3.1 GENERAL INFORMATION

This section contains interconnect diagrams, mounting dimensions and other information

pertaining to the installation of the MD41-( ). After installation of cabling and before

installation of the equipment, ensure that power is applied only to the pins specified in the

interconnect diagram.

3.2 UNPACKING AND INSPECTING EQUIPMENT

When unpacking equipment, make a visual inspection for evidence of damage incurred during

shipment. The following parts should be included:

1. MD41-324 (14V) or MD41-328 (28V) Horiz. Mount

MD41-334 (14V) or MD41-338 (28V) Vert. Mount

MD41-328(5V) (28volt) 5 volt button lighting Horiz. Mount

MD41-338(5V) (28volt) 5 volt button lighting Vert. Mount

2. J1 Connector Kit (25 pin). MCI PN 7014517

3. J2 Connector Kit (50 pin). MCI PN 7014509

4. Installation Manual. MCI PN 7016074

5. 4-40 x 1.0” Mounting Screws, 4ea. MCI PN 7016165

3.3 MOUNTING THE MD41-( )

Plan a location in the aircraft for the MD41-( ) to be mounted as close to the pilot’s field of

view as possible. The preferable location is near the HSI/CDI that will be displaying the GPS

information. Avoid mounting close to heater vents or other high heat sources. Allow a

clearance of at least 3 inches from back of unit for plug removal.

The indicator is secured in place behind the panel since it is designed for rear mount only.

Make a panel cutout as shown in Figure 3-3. Secure the indicator in place with four 4-40 x 3/8

to 1.0” flat head phillips screws. A MD156 adapter plate is available for front mount

installations. Also a MD155 punch is available for hole cutout.

3.4 INSTALLATION LIMITATIONS

Wire the aircraft harness according to figure 3-5 or 3-6. Use at least 24 AWG wire for all

connections. You MUST use shielded wire where shown. Avoid sharp bends and routing

cable near high energy sources. Care must be taken to tie the harness away from aircraft

controls and cables. Normal installation techniques should be applied.

REV. 4 Jan. 09, 1997 10

REAR VIEW OF J1 (bottom) CONNECTOR

PIN NO.

1 ---------------- NO7 RELAY

2 ---------------- NC7 RELAY

3 ---------------- ILS ENERGIZE TO AUTOPILOT

4 ---------------- ILS FROM NAV (VOR) REC (for autopilot)

5 ---------------- C8 RELAY

6 ---------------- NC8 RELAY

7 ---------------- NO8 RELAY

8 ---------------- GPS APR ACTV ANNUNCIATION

9 ---------------- OBS HOLD (logic low to GPS)

10 -------------- MSG ANNUNCIATION

11 -------------- WPT ANNUNCIATION

12 -------------- 14 VDC UNIT PWR -324/334 ONLY

13 -------------- 28 VDC UNIT PWR -328/338/328(5V)/338(5V) ONLY

14 -------------- ILS FROM NAV (VOR) REC. (for ILS override)(optional)

15 -------------- C7 RELAY

16 -------------- APR ARM ANNUNCIATION

17 -------------- GPS DISPLAYED (gnd to GPS)

18 -------------- C5 RELAY

19 -------------- NC5 RELAY

20 -------------- DIM LOW (to lighting bus)(for push-button lighting)

21 -------------- DIM HIGH (to lighting bus)(for push-button lighting)

22 -------------- NO5 RELAY

23 -------------- TO NAV CIRCUIT BREAKER (for fault monitoring)

24 -------------- GPS ARM (momentary logic low to GPS)

25 -------------- POWER GROUND

FIGURE 3-1 SCHEMATIC PINOUT, 25 PIN DSUB

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