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Century IIB Service Manual

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CENTURY FLIGHT SYSTEMS, INC.
P.O. BOX 610
MINERAL WELLS TX 76068
PH. (940)325-2517 FX. (940)325-2546
SALES (800)433-5630
TECH SERVICES (940)325-2716 EXT. 603
TECH LIBRARIAN (800)633-8530 EXT. 619
WEB SITE: www.centuryflight.com
FOR AEA /RESOURCE ONE WEB-SITE
Check with Century Flight Systems for latest rev level
CENTURY IIB & III
AUTOPILOT
SERVICE MANUAL
REFERENCE COPY
Flight Systems, Inc.
Manufacturers of autopilots since 1983.
68S54
REVISION 6 FEBRUARY 28, 2000
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  • Page 1 WEB SITE: www.centuryflight.com CENTURY IIB & III AUTOPILOT SERVICE MANUAL Flight Systems, Inc. Manufacturers of autopilots since 1983. REFERENCE COPY FOR AEA /RESOURCE ONE WEB-SITE Check with Century Flight Systems for latest rev level 68S54 REVISION 6 FEBRUARY 28, 2000...
  • Page 2 CAUTION The material in this publication is subject to change. Before attempting any maintenance or installation operation equipment covered this publication, verify that you have complete and up-to- date publications by referring to the Revision date, or call you documentation.
  • Page 3 PO BOX 610 MINERAL WELLS, TX 76068 (817)325-2517 HOLDERS OF SERVICE MANUAL FOR CENTURY IIB & III AUTOPILOT NUMBER 68S54 FROM: CENTURY FLIGHT SYSTEMS, INC. PUBLICATION DEPARTMENT REVISION 6 DATED FEBRUARY 28, 2000 Replace pages as instructed below: REMOVE INSERT 1.
  • Page 4 RECORD OF REVISIONS SERVICE MANUAL 68S54 CENTURY IIB & III AUTOPILOT ISSUE DATE DATE INSERTED ISSUE DATE DATE INSERTED June 30, 1994 June 2, 1995 Sept. 1, 1995 Sept. 1, 1996 Dec. 1, 1997 Feb. 28, 2000 NOTE: The material in this publication is subject to change. Before attempting any maintenance operation on the equipment covered in this publication, verify that you have complete and current publications by referring to the date of the revision.

  • Page 5: Table Of Contents

    Advisory Precautions ................Page iv Warranty ..................Page v SECTION I GENERAL INFORMATION 1.1. Introduction..................Page 1-1 1.2. Century IIB - Description..............Page 1-1 1.3. Century III - Description ..............Page 1-2 SECTION II CENTURY IIB 2.1. Detailed Theory of Operation............Page 2-1 2.2. Regulator and Oscillator ..............Page 2-1 2.3.
  • Page 6 Quick Checks Century III Troubleshooting Logic Chart Pitch Section..Page 8-9 Century IIB & III w/Standard D.G.Ground Set-Up Procedures....Page 8- Century IIB & III w/NSD Ground Set-UP Procedure.......Page 8-12 Figure 1 Test Hook-Up................Page 8-13 Figure 2 Test Hook-Up................Page 8-14 Figure 3 Test Hook-Up................Page 8-15 Figure 4 Test Hook-Up..............
  • Page 7 TABLE OF CONTENTS (cont.) SECTION IX (cont.) Part C Radio Couplers................Page 9-3 1C388-M / Outline Drawing 1C388-MC / Outline Drawing 1C388-2 / Outline Drawing 1C388-3 / Outline Drawing 79C189 / Final Assy 1C388-M 79C190 / Final Assy 1C388-MC 79C216 / Final Assy 1C388-2 79C229 / Final Assy 1C388-3 1D642 &...

  • Page 8: Advisory Precautions

    ADVISORY PRECAUTIONS The following precautions must be observed when handling this equipment the MOS devises where applicable. Failure to observe all of these precautions can cause permanent damage to the Electrostatic Discharge Sensitive Devise. This damage can cause the devise to fail immediately or at a later date when exposed to an adverse environment.
  • Page 9 4. Cost of transportation, removal or reinstallation are at the option of Century Flight Systems, Inc. 5. This Century Flight System, Inc. sole express warranty with respect to the goods supplied herein. CENTURY FLIGHT SYSTEMS, INC. MAKES NO OTHER EXPRESS WARRANTY OF ANY KIND WHATSOEVER. CENTURY...

  • Page 10: Section I

    The Roll Signal Filter is a device that tells the Century IIB amplifier how fast the roll horizon is moving. The Roll Signal Filter is in series with the Artificial Horizon. A constant roll horizon signal is passed through the unit unchanged along to the amplifier.
  • Page 11 Pitch button to allow engagement of the pitch channel if only the Altitude button is pressed after the Roll button is engaged. Optional capabilities for the Century III includes a Radio Coupler for intercepting and tracking of navigational radio signals and interfacing of an HSI to the autopilot. Glideslope intercepting and tracking is another option available on the Century III.

  • Page 12: Century Iib

    SECTION II CENTURY IIB 2.1. DETAILED THEORY OF OPERATION This section contains a detailed theory of operation for the 1C385-( ) console/amplifier. Components listed in this theory of operation can be found on schematic drawing 63D255 located in Section IX of this manual.

  • Page 13: Summing Point

    2.5. SUMMING POINT The output of the first synchronous filter is applied through R21. This is a select resistor used to set the maximum bank range (26?) of the autopilot. Q7 is the summing point of all the signal inputs applied to the amplifier. Q7 will amplify the signal and apply it to the second synchronous filter, Q8 and Q9.

  • Page 14: Century Iii

    Section IX of this manual. Although this theory only explains one type of autopilot amplifier for the Century III, the earlier amplifier (1D395 and 1C515) circuits are similar enough for the Technician to understand and have a general knowledge of it's circuit flow.

  • Page 15: Rate Circuit

    synchronous filter consisting of Q3 and Q4 and their associated components introduces bank limiting. The left and right bank pots located on the console apply different phases of excitation to the base of Q3 and Q4. The amount of excitation applied to these transistors will cause the signal from the lag circuit to be limited.

  • Page 16: 3.10. Pitch Circuit

    The meter on the face of the console is a view to the pilot of what the pitch channel in the amplifier is doing. Many years ago, autotrim was an option for the Century III. The meter was used by the pilot to apply trim when the meter would deflect. It is used now as a pitch effort meter for the pilot before engaging the Pitch button on the console.

  • Page 17: Flight Adjustment Potentiometer

    resistors form a phase detector circuit. CR1 or CR2 will conduct, depending on the phase of the signal detected by Q1, allowing rectified voltage to be applied to C3 and C4 where it will filter the voltage and apply it to the meter leads. Meter scaling is such that approximately 3 volts of motor drive will indicate full meter deflection.

  • Page 18: Radio Couplers Detail Of Operation

    The radio coupler is designed to accept VOR/LOC radio information and process it with Directional Gyro information in order to develop a composite signal for the Century IIB or Century III autopilot amplifier. 4.3.

  • Page 19: Radio Phase Detector

    4.8. 1C388-2 This coupler is designed to be used with Century Flight Systems HSI’ s, the NSD-360, 360A and the 1000. It may also be used with a certain model of HSI manufactured by Sigma Tek, Inc. Refer to schematic drawing 63D312. The top board (1D642-1) is basically the same as the top board in the 1C388M except for the feedback area of IC1.

  • Page 20: 1C388-3

    to the heading and course potentiometers when in the LOC REV position. With the reversing of the radio input signal and the phase of the roll excitation, reverse tracking is accomplished automatically without having to move the HSI’ s inbound front course. 4.9.

  • Page 21: Console Detail Theory Of Operation

    CD20 & CD40. Refer to schematic drawing 63D354. The console provides the means for the pilot to engage and disengage the Century III autopilot and the modes of the autopilot through rocker buttons. The console has pilot controlled manual roll and pitch commands and six in-flight adjustment potentiometers.

  • Page 22: Pitch Effort Meter

    5.7. PITCH EFFORT METER Located on the front of the console is a meter which represents pitch servo drive. This meter is used to tell the pilot the state of drive of the pitch servo before he engages the pitch rocker button. This meter is not linear to servo drive.

  • Page 23: G/S Radio Signal Processing

    This section contains a detailed theory of operation for the 1C493 G/S coupler. This coupler is designed to be used with the Century III autopilot and the optional radio coupler to provide complete ILS capability. Refer to schematic drawing 63D168-1 in Section IX of this manual.

  • Page 24: Integrator

    Engaging or coupling of the glideslope is set when the amplitude of the radio signal is at 4% up. R64 sets the engage flip-flop point. The negative processed radio signal is applied to one end of R64. When the wiper of R64 becomes positive enough, it will turn on Q18 and in turn Q19 will turn off.

  • Page 25: Section Vii Roll & Pitch Signal Filters Detail Theory Of Operation

    The diodes and capacitor rectify and filter the DC voltage. NOTE The 1B440-1 may only used on the older Century III’ s which have the 1D395 amplifier installed as specified by the STC. Only one signal filter may be used in the autopilot system as specified by the STC.

  • Page 26: Section Viii Test Equipment In Aircraft Troubleshooting

    DESCRIPTION The 66D141 Test Kit is designed to facilitate testing of the Century IIB and the Century III autopilot systems on a substitution basis. Provisions are made to substitute any major component except the amplifier in the Century III and the console amplifier in the Century IIB.
  • Page 27 66D141-4 RADIO COUPLER/GS SIGNAL SOURCE This unit contains a simulated radio signal source for lateral radio intercept and tracking and a radio signal for arming and engagement of Glideslope. Direct monitoring of the radio coupler output is provided by parallel connector and is displayed on a meter.

  • Page 28: Quick Checks Century Iib Troubleshooting Logic Chart

    QUICK CHECKS CENTURY IIB TROUBLESHOOTING LOGIC CHART AIRCRAFT MASTER SWITCH “ ON” . ON CIIB 1. ROLL CMD CENTERED HORIZON: 2. TILTED LESS THAN 30? CIRCUIT BREAKER TRIPS OFF: PRESS ROLL SWITCH 1. CHECK WIRING “ ON” . 2. CHECK SERVO 3.
  • Page 29 QUICK CHECKS CENTURY IIB TROUBLESHOOTING LOGIC CHART (cont.) ON CIIB PRESS HDG SWITCH “ ON” . IF COUPLER INSTALLED SWITCH TO HDG. ROTATE HEADING BUG START ENGINE IF LEFT AND RIGHT OF HORIZON INDICATES LUBBER LINE. MORE THAN 20?. CONTROL WHEEL...
  • Page 30 QUICK CHECKS CENTURY IIB TROUBLESHOOTING LOGIC CHART (cont.) CONTROL WHEEL CONTROL WHEEL FOLLOWS L-R RADIO. DOES NOT FOLLOW L-R RADIO. CHECK L-R INPUT TO COUPLER. COUPLER LIKELY DEFECTIVE. END OF QUICK CHECK.

  • Page 31: Quick Checks Century Iii Troubleshooting Logic Chart Roll Section

    QUICK CHECKS CENTURY III TROUBLESHOOTING LOGIC CHART ROLL SECTION AIRCRAFT MASTER SWITCH “ ON” . ON CIII 1. ROLL CMD CENTERED HORIZON: 2. TILTED LESS THAN 30? CIRCUIT BREAKER TRIPS PRESS ROLL SWITCH OFF: “ ON” . 1. CHECK WIRING 2.
  • Page 32 QUICK CHECKS CENTURY III TROUBLESHOOTING LOGIC CHART ROLL SECTION (cont.) ON CIII PRESS HDG SWITCH “ ON” . IF COUPLER INSTALLED SWITCH TO HDG. ROTATE HEADING BUG START ENGINE IF LEFT AND RIGHT OF HORIZON INDICATES LUBBER LINE. MORE THAN 20?.
  • Page 33 QUICK CHECKS CENTURY III TROUBLESHOOTING LOGIC CHART ROLL SECTION (cont.) CONTROL WHEEL CONTROL WHEEL FOLLOWS L-R RADIO. DOES NOT FOLLOW L-R RADIO. CHECK L-R INPUT TO COUPLER. COUPLER LIKELY DEFECTIVE. END OF QUICK CHECK.

  • Page 34: Quick Checks Century Iii Troubleshooting Logic Chart Pitch Section

    QUICK CHECKS CENTURY III TROUBLESHOOTING LOGIC CHART PITCH SECTION 1. START ENGINE IF HORIZON INDICATES MORE THAN 5? IN PITCH. 2. PRESS THE PITCH SWITCH ON THE ROTATE PITCH COMMAND KNOB TO CONTROL WHEEL MOVES CONTROL WHEEL DOES NOT AMPLIFIER POSSIBLY...
  • Page 35 QUICK CHECKS CENTURY III TROUBLESHOOTING LOGIC CHART PITCH SECTION (cont.) IF A/C HAS THE GLIDESLOPE COUPLER OPTION INSTALLED, TUNE END OF TEST. RADIO TO A LOCALIZER FREQUENCY TO SIMULATE GLIDESLOPE CAPTURE. TURN RADIO COUPLER TO LOC NORM TURN THE SIMULATED G/S RADIO SIGNAL TO INDICATE 100% UP.
  • Page 36 CENTURY IIB & III WITH STANDARD D.G. GROUND SET-UP PROCEDURES 1. Unplug CD18 from Attitude Gyro. 2. Plug CD18 into CD18 connector on 66D141-1 Gyro Substitute Box. (Place switch to roll position.) Set indicator to 0?. 3. Turn on Aircraft Master Switch.
  • Page 37 CENTURY IIB & III WITH NSD GROUND SET-UP PROCEDURE 1. Unplug CD18 from Attitude Gyro 2. Plug CD18 into CD18 connector on 66D141-1 Gyro Substitute Box. (Place switch to roll position and set indicator to 0?). 3. Turn on Aircraft Master Switch.
  • Page 38 Figure 1 TEST HOOK-UP...
  • Page 39 Figure 2 TEST HOOK-UP...
  • Page 40 Figure 3 TEST HOOK-UP...
  • Page 41 Figure 4 TEST HOOK-UP...

  • Page 42: Century Iib & Iii Flight Adjustments

    CENTURY IIB FLIGHT ADJUSTMENTS CENTURY III FLIGHT ADJUSTMENTS...
  • Page 43 28 ? 1volt peak to peak at 5Khz ? 500hz. NOTE: The 66D141-1 test box cannot be field calibrated. This box must be sent to Century Flight Systems Service Center for calibration every 12 calendar month in accordance with Advisor Circular 43.13-1B paragraph 12-53 (c).
  • Page 44 7. Connect signal lead of scope to the center wiper of the roll trim pot. Turn roll trim knob to it’ s center marked position. Reading on scope should indicate 0 ? 10mvpp. If reading is not correct, loosen the mounting nut and turn body of the pot for proper reading on scope. Secure mounting nut and remove scope lead.
  • Page 45 CALIBRATION PROCEDURES FOR 66D141-2 TEST EQUIPMENT REQUIRED: Meter Calibrator or precision DC power supply 0 - 30 volts 1. Check meter centering position on -2 box. Adjust if necessary. 2. Remove back cover on -2 box and connect positive lead of meter calibrator to the yellow wire from the 300K (R 1) resistor on the terminal strip.
  • Page 46 CALIBRATION PROCEDURES FOR 66D141-4 TEST EQUIPMENT REQUIRED: Meter Calibrator or precision DC power supply 1. Check meter centering and adjust if necessary. Set meter calibrator to 150 mvdc. 2. Connect positive lead of meter calibrator to pin A and the negative lead to pin B of CD 34 of the -4 box.

  • Page 47: 63D255 / Schematic

    SECTION IX SCHEMATIC DIAGRAMS, COMPONENT LAYOUTS, AND ASSEMBLY DRAWINGS Part A Century IIB DRAWING NUMBER DRAWING TITLE REVISION DATE 1D681-1 P.C. BOARD ASSEMBLY 07-07-99 1D681 & -2 P.C. BOARD ASSEMBLY 10-08-98 1D681-3 P.C. BOARD ASSEMBLY 07-08-99 63D255 SCHEMATIC 09-10-98 1C385...

  • Page 48: Part B Century Iii

    SECTION IX SCHEMATIC DIAGRAMS, COMPONENT LAYOUTS, AND ASSEMBLY DRAWINGS Part B Century III DRAWING NUMBER DRAWING TITLE REVISION DATE 1C515-1 OUTLINE DRAWING 03-22-79 1C515-2 OUTLINE DRAWING 03-22-79 1C515-3 OUTLINE DRAWING 08-02-93 1C515-4 OUTLINE DRAWING 03-22-79 1C515-5 OUTLINE DRAWING 03-22-79 1D424 -2 -3 -4 -5 -6...
  • Page 49 SECTION IX SCHEMATIC DIAGRAMS, COMPONENT LAYOUTS, AND ASSEMBLY DRAWINGS Part C Radio Couplers DRAWING NUMBER DRAWING TITLE REVISION DATE 1C388-M OUTLINE DRAWING 06-03-94 1C388-MC OUTLINE DRAWING 06-03-94 1C388-2 OUTLINE DRAWING 06-03-94 1C388-3 OUTLINE DRAWING 06-03-94 79C189 FINAL ASSY 1C388-M 06-03-94 79C190 FINAL ASSY 1C388-MC 06-03-94...
  • Page 50 SECTION IX SCHEMATIC DIAGRAMS, COMPONENT LAYOUTS, AND ASSEMBLY DRAWINGS Part D Console DRAWING NUMBER DRAWING TITLE REVISION DATE 1C404 CIII CONSOLE OUTLINE DWG 1 of 4 04-03-81 1C404 CIII CONSOLE OUTLINE DWG 2 of 4 09-09-81 1C404 CIII CONSOLE OUTLINE DWG 3 of 4 07-09-81 1C404 CIII CONSOLE OUTLINE DWG 4 of 4...
  • Page 51 SECTION IX SCHEMATIC DIAGRAMS, COMPONENT LAYOUTS, AND ASSEMBLY DRAWINGS Part E Glideslope Coupler DRAWING NUMBER DRAWING TITLE REVISION DATE 1C493 OUTLINE DRAWING 1 of 1 07-07-93 1C493 OUTLINE DRAWING 2 of 2 07-07-93 79D42 FINAL ASSEMBLY 02-26-90 79C40 INTERNAL CABLE INTERCONNECT 05-29-92 79D41-1 P.C.
  • Page 52 SECTION IX SCHEMATIC DIAGRAMS, COMPONENT LAYOUTS, AND ASSEMBLY DRAWINGS Part F Roll & Pitch Signal Filters DRAWING NUMBER DRAWING TITLE REVISION DATE 1B440 OUTLINE DRAWING 03-29-72 1B440-1 OUTLINE DRAWING 10-09-71 1B440-2 OUTLINE DRAWING 06-12-74 79B25-1 FINAL ASSEMBLY 1B440 07-02-79 79B36-1 FINAL ASSEMBLY 1B440-1 04-02-79 79B36-2...

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