Sandia Aerospace SAC 7-35 User Manual
SAC 7-35
Airdata Computer
Installation Manual
SANDIA aerospace, Inc.SANDIA aerospace, Inc.
SANDIA aerospace, Inc.
SANDIA aerospace, Inc.SANDIA aerospace, Inc.
3700 Osuna Rd. NE, Suite 711
Albuquerque, NM 87109
www.sandia.aero
305586-00
This document and the information contained herein is the proprietary data of SANDIA aerospace, Inc.
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No part of this document may be transmitted, reproduced, or copied in any form or by any means
without the prior written consent of SANDIA aerospace, Inc. Due to SANDIA aerospace’s continued
product and quality improvement programs, information contained in this document is subject to change
without prior notice.
Copyright 2009 SANDIA aerospace, Inc., All rights reserved. Printed in USA
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Table Of Contents
Record of Revisions ..................................................................................................................... 1
Table of Contents ...................................................................................................................... 2
List of Illustrations ...................................................................................................................... 2
Section 1 - General Description
1.1 Introduction .................................................................................................................... 4
1.1.1 Product Description ............................................................................................ 4
1.2 Technical Characteristics................................................................................................ 5
1.2.1 Physical Characteristics ......................................................................................... 5
1.2.1.1 SAC 7-35 ..................................................................................................... 5
1.2.1.2 STP 78 OAT Probe....................................................................................... 5
1.2.2 Operational Characteristics ................................................................................... 5
1.2.3 Operating Limitations......................................................................................... 5
1.2.4 Outputs ............................................................................................................... 7
1.2.4.1 RS 232 .......................................................................................................... 7
1.2.4.1.1 RS 232 (A and B) Airdata Output........................................................ 7
1.2.4.1.2 RS 232 (C and D) Corresponding Altitude Output ............................. 8
1.2.4.2 ARINC 429 High Speed Labels ................................................................... 8
1.2.4.3 Gillham Grey Code Output .......................................................................... 8
1.2.4.4 AIM Output .................................................................................................. 8
1.2.5 Inputs .................................................................................................................. 9
1.2.6 Certification ........................................................................................................ 9
Section 2 Installation Considerations
2.1 Introduction .................................................................................................................... 12
2.2 Mounting Considerations ............................................................................................... 13
2.3 Cooling ......................................................................................................................13
Section 3 Installation Procedures
3.1 General ......................................................................................................................14
3.2 Equipment Required ....................................................................................................... 14
3.2.1 Equipment Supplied ........................................................................................... 14
3.2.2 Equipment Required But Not Supplied .............................................................. 14
3.3 Mounting Tray Installation ............................................................................................. 14
3.4 Static and Pitot Port Connection..................................................................................... 16
3.5 OAT Probe Mounting and Connection ........................................................................... 16
3.6 Electrical Installation ......................................................................................................17
3.7 Fuel Flow Interconnect ................................................................................................... 18
3.8 Synchro Inputs ................................................................................................................ 18
3.9 BARO Interface .............................................................................................................. 18
3.10 Transponder Interconnect ............................................................................................... 19
3.11 AIM Interconnect ........................................................................................................... 19
Section 4 Configuration and Calibration
4.1 Setup for Configuration .................................................................................................. 24
4.2 Changing Configuration Parameters .............................................................................. 24
4.3 Status Line Descriptions ................................................................................................. 26
4.3.1 Serial Port Settings ............................................................................................. 27
4.3.2 Airspeed Trim ..................................................................................................... 27
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Table Of Contents Con’t
4.3.3 Synchro Input Settings .......................................................................................... 27
4.3.4 Altitude Trim......................................................................................................... 28
4.3.5 BARO Setting Trim .............................................................................................. 28
4.3.6 Airspeed Cutoff .................................................................................................. 29
4.3.7 Fuel flow Configuration and K-factor ................................................................ 29
4.3.8 List Inputs ........................................................................................................... 29
4.3.9 ARINC Mode ..................................................................................................... 29
4.3.10 OAT Probe Trim ................................................................................................. 30
4.4 Continued Airworthiness ................................................................................................ 30
List Of Illustrations
Figure 1-1 System Configuration Diagram .............................................................................. 4
Figure 1-2 SAC 7-35 Environmental Qualification Form...................................................... 10
Figure 1-3 OAT Probe Environmental Qualification Form.................................................... 11
Figure 3-1 Mounting Tray Dimensions.................................................................................. 15
Figure 3-2 SAC 7-35 Outline Dimensions ............................................................................. 15
Figure 3-3 OAT Probe Dimensions ........................................................................................ 16
Figure 3-4 OAT Probe Mounting ........................................................................................... 17
Figure 3-5 Fuel Flow Interconnect......................................................................................... 18
Figure 3-6 AIM Interconnect ................................................................................................. 19
Figure 3-7 Gilham Gray Code Interconnect w/ Most Popular Transponders ........................ 20
Figure 3-8 SAC 7-35 Interconnect Wiring Diagram.............................................................. 21
Figure 3-9 Front Panel Connector Location........................................................................... 23
Figure 4-1 6 Pin Din to Serial Interconnect ........................................................................... 24
Figure 4-2 RS-232 Status Lines Setting ................................................................................... 26
Figure 4-3 SAC 7-35 Configuration Mode - Unit Trim S tatus................................................... 26
Figure 4-4 SAC 7-35 Configuration Mode - Fuel Unit Status ................................................... 26
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Section 1 General Description
1.1 INTRODUCTION
This manual describes the installation of the SANDIA aerospace SAC 7-35 Airdata Computer. It is
intended for use by FAA certified repair stations to install the SAC 7-35 Airdata Computer and includes both the mechanical and electrical installation information for the SAC 7-35. Calibration, system configuration and checkout procedures are included. The installer should ensure that all functions
are operating according to their intended purpose in their particular installation.
1.1.1 Product Description
The SAC 7-35 is a solid state -1000 to 35,000 foot airdata computer and altitude encoder. With the addition
of a fuel flow transducer(s), the SAC 7-35 will also provide fuel flow data to systems capable of displaying that
information. The SAC 7-35 provides five data outputs that allow it to interface with a wide range of transpon-
ders, T A WS, MFD’ s, Navigation Systems and a variety of other avionics products. The SAC 7-35 can also
be installed for use in a variety of converter functions. Contact factory for more information.
• One ARINC 429 High Speed output, airdata and/or ADS-B.
• Two RS-232 airdata output ports (including fuel flow or ADS-B).
• Two RS-232 serial encoder outputs
Note: All four of the RS-232 outputs can be individually configured to match the system(s)
being interfaced.
• One Gillham Grey code output for legacy transponders.
• One SANDIA Altitude In-flight Monitoring (AIM) feature. With the addition of an optional
panel mounted switch and annunciator the AIM mode will monitor and advise the pilot if the
aircraft deviates from a selected altitude.
All calibration and configuration is accomplished via a lap top computer through the 6 pin Din connector on the front of the SAC 7-35.
Pitot
Static
OAT
Syncro Heading
Baro Pot *
Fuel **
GPS Track
* Optional
** Single or Twin
SAC 7-35
Airdata Computer
Figure 1-1
System Configuration
Grey Code to Transponder
RS 232 Corresponding Alt. C
RS 232 Corresponding Alt. D
RS 232 Airdata A
RS 232 Airdata B
ARINC 429 Airdata
AIM (Altitude In-flight
Montoring)
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1.2 TECHNICAL CHARACTERISTICS
1.2.1 Physical Characteristics
1.2.1.1 SAC 7-35
Width: 4.87” (5.11” with mounting tray)
Height: 1.89” (2.35” with mounting tray)
Depth: 5.62” (5.62” with mounting tray)
W eight: 1.18 lbs. (1.39lbs. with mounting tray)
1.2.1.2 STP 78 OAT Probe
See Fig 3.3 for Dimensions
W eight: .067 lbs
1.2.2 Operational Characteristics
Operating Temp. -20o C to + 55o C
Input Voltage: 11 - 32 Vdc
Current 1.0 amp maximum with heater on
Altitude Range -1000’ to 35,000’
PressureAltitude T olerance: 0’ +/- 25’
Resolution: Grey Code 100’
Density Altitude Accuracy Pressure Alt Correction Tolerance
Maximum Vertical Speed: 9,999 fpm Serial
Accuracy
2000’ +/- 25”
3000‘ +/- 30’
4000’ +/- 25’
5000’ +/- 25’
8000 +/- 30’
11000’ +/- 35’
14000’ +/- 40’
17000’ +/- 45’
20000’ +/- 50’
30000’ +/- 100’
40000’ +/- 125’
RS232 10’
ARINC 429 1’
1000’ - 18000’ (P Alt) 250 ft. max.
20,000 fpm ARINC 429
±1000 ft/min at ±20000 ft/min
±0300 ft/min at ±6000 ft/min
±0200 ft/min at ±4000 ft/min
±0100 ft/min at ±2000 ft/min
±0050 ft/min at ±1000 ft/min
±0045 ft/min below ±1000 ft/min
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Indicated Airspeed: 0-450 KTS
0.088-.999 MACH
Accuracy
MACH Number Accuracy
0.3 to 0.4 0.012
.0.5 0.010
0.6 0.0075
0.7-0.9 0.0050
.95 0.0075
True Airspeed Accuracy ALT IAS TAS TAS Accuracy
10000 50 53 6.6
10000 100 105 3.0
10000 200 211 3.3
10000 300 314 4.6
10000 400 416 5.9
10000 450 467 6.5
30000 50 80 10.1
30000 100 160 4.6
30000 200 315 5.2
30000 300 460 6.9
Kts Accuracy
50 5.0
80 3.5
100 2.0
120 2.0
150 2.0
200 2.0
250 2.4
300 2.8
350 3.2
400 3.6
450 4.0
MACH Tolerance
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1.2.2 Operational Characteristics con’t
Wind Speed: 0-200 KTS
Accuracy 6.5 Kts
Wind Direction Accuracy 10 degrees
Air T emp:
Range: -60
Accuracy +1.5
o
C to +60oC
o
C
Fuel Flow:
Flow Rate: 1-14400 GPH
K-Factor Range 500-130,000
Outside Air Temperature -60
Accuracy 1.5
o
C - +60oC
o
C
The SAC 7-35 fuel flow conversion is limited to 2000 input pulses per second
For example, do not install where the K factor and maximum fuel flow exceed:
500K — 14,400 gph 19700K — 365 gph
84600K — 85 gph 130000K — 55 gph
1.2.3 Operating Limitations
1.2.3.1 All functions of the SAC 7-35 meet the appropriate design assurance qualifications for a
secondary system for airplanes in Class I, Class II and Class III in accordance with AC
23.1309-1D, Figure 2. The TSO authorization with the RTCA/DO178B software levels by
functions are listed in Section 1.2.6
1.2.3.2 The SAC 7-35 is for navigation information only and not for primary flight information.
1.2.3.3 Fuel flow limited to 2000 input pulses per second.
1.2.4 Outputs
1.2.4.1 RS-232
1.2.4.1.1 RS-232 (A & B) Airdata
The airdata outputs supported by the SAC 7-35 are Garmin Z-message, Garmin-G and
King D. Each of these output formats work with ‘Aviation’ format input.
The SAC 7-35 will also interface to a Garmin ADS-B serial output on port -B at 9600
baud. When connected to ADS-B input no serial data is output on port-B.
Baud Rate Installation Configurable to 1200, 9600, 19200 or 38400
Data Bits 8
Stop Bit 1
Parity None
Output Rate: 1 +/- .2 seconds
Altitude Resolution 10”
Airspeed Resolution 1 Kt
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1.2.4.1.2 RS 232 (C & D) Corresponding Altitude
The SAC 7-35 supports Garmin and Garmin AT RS232 Corresponding Altitude formats.
Baud Rate Installation Configurable to 1200, 9600, 19200 or 38400
Data Bits 8
Stop Bit 1
Parity None
Output Rate: 1 +/- .2 seconds
Altitude Resolution 10”
1.2.4.2 ARINC 429, High Speed
If Selected, the following 100 kbit/sec (High Speed) ARINC 429 Airdata Labels are transmitted by the SAC 7-35:
Label Parameter Units Repeat Rate Range Resolution
162 Density Altitude Feet 62.5ms 131072 1
203 Pressure Altitude Feet 62.5ms 131072 1
204 Baro Altitude Feet 62.5ms 131072 1
205 MACH Number Mach 62.5ms 4.0 6.25E-5
206 IAS Knots 62.5ms 1024 0.0625
210 True Airspeed Knots 62.5ms 2048 0.0625
211 T otal Air Tem p degC 500ms 512 0.25
212 Altitude Rate ft/min 62.5ms 32768 16
213 Static Air T emp degC 500ms 512 0.25
235 Baro Setting InHg 62.5ms 39.999 0.001
244 Total Fuel Flow Lb/hr 62.5ms 32768 0.5
315 Wind Speed Knots 500ms 256 1
316 Wind Direction Deg True 500ms 360 0.05
320 Magnetic Heading Deg Mag 62.5ms 360 0.0055
347 L/R Fuel Flow Lb/hr 62.5ms 32768 0.5
(Alternates L/R)
If selected, the following 100 kbit/sec (High Speed) ARINC 429/743 ADS-B Labels are transmitted by the SAC 7-35 (-01 version only):
Label Parameter Units Repeat Rate Range Resolution Data bits
103 Ground Track Degrees as received 180 0.0055 15
110 Latitude degrees as received 180 1.7E-4 20
111 Longitude degrees as received 180 1.7E-4 20
112 Ground Speed knots as received 4096 0.125 15
120 Fine Latitude degrees as received 1.7E-4 8.4E-8 11
121 Fine Longitude degrees as received 1.7E-4 8.4E-8 11
130 Horiz Prot Level nm 1 sec 16 1.22E-4 17
133 Vert Prot Level feet 1 sec 32768 0.125 18
136 Vert. Fig of Merit feet 1 sec 32768 0.125 18
165 Vert Velocity fpm as received 32768 1 1 5
166 North/South Velocity knots as received 4096 0.125 15
174 East/W est Velocity knots as received 4096 0.125 15
247 Horiz Fog of Merit nm 1 sec 16 6.10E-5 18
273 GPS Status discr 1 sec discr discr discr
335 Track Angle Rate deg/s as received 32 0.015625 11
370 GPS Height feet as received 131072 0.125 20
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1.2.4.3 Gillham Grey Code Outputs
a. 10 Bits available: D4, A4, A2, A1, B4, B2, B1, C4, C2, C1
b. Bit On Impedance: Less than 5 ohms
c. Bit Off Leakage: Less than 10uA
d. Maximum Current per bit: 20 mA
e. Minimum working current: 10 uA
f. Maximum voltage per bit: 50V
g. Minimum working voltage: 5V
h. Bit update rate: Less than 250 mS
i. Minimum strobe switching bandwidth: Greater than 10kHz
1.2.4.4 AIM Outputs
Maximum Lamp Current:80 mA
Maximum off Voltage: 50V
1.2.5 Inputs
Static Pressure -1000 to 35,000 feet
Pitot Pressure 0 to 450 Kts
Outside Air Temp (OA T) -60O to +60O C
Heading ARINC 407 Syncro (line voltage 11.8 Vrms)
Fuel Flow 0 to 14400 GPH (2000 pulses/sec max)
K-factor 500-130000
Baro 0 to +5Vdc Baro Pot
AIM Pushbutton Active Low with Internal Pull Up
Strobe From On board Transponder
Leg H 10 ΚΩ
Leg X 17 ΚΩ
Leg Y 17 ΚΩ
1.2.6 Certification
TSO C88a (Encoder)
TSO C106 (Airdata Computer)
ETSO C88a
ETSO C106
Hardware DO 160E
Software DO 178B Level C
Complex Hardware DO-254 Level C
“The conditions and test required for TSO approval of this article are minimum performance standards. It is the responsibility of those desiring to
install the article either on or within a specific type or class of aircraft to
demonstrate that the aircraft installation conditions are within the TSO standards. The article may be installed only if installation of the article is
approved by the Administrator.”
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