Figure 7 ARINC HSI with Century II or III. 1049-2510-01 Equipment Installation Manual for the GDC31 1. Autopilot Offset. Slide 3: Operation of DG version Radio Couplers 1C388, 1C388M, 1C388C, 1C388MC Uses Left/Right deviation from the GPS/NAV or in the case of the EFD1000, the ACU. ACU HDG Datum output (PFD HDG Bug) controls A/P HDG Mode ACU HDG Datum output controls GPSS operation via autopilot HDG Mode ACU HDG Datum output controls the autopilot “CRS*” input in NAV/OMNI/LOC Modes *CRS input is the heading datum input with these radio couplers (the PFD HDG Bug will be used in place of the CRS pointer) Century II/III Basics 3. Slide 8: Roll “null” Centering All autopilots have a roll centering adjustment including the Century II/III. This impressive figure makes Etanorm the most successful standardised water pump on the global market. Since then, we have sold over 1.5 million of these standardised water pumps. Is one of KSB’s classic products – its history dates back to 1936. KSB also has a wealth of expertise in the area of circulators. Burgmann pump maintenance manual. The roll centering adjustment is used to “null” out any offsets in the VG (Attitude Indicator) or HDG Datum signal. Most installations will require the adjustment of the roll centering pot after the installation of the EFD1000. The mechanical DG or HSI that is removed did not have a centered HDG Datum when the HDG Bug was under the lubber line. The ACU does. Autopilot Basics Aircraft flies right or left of the runway during approach or the CDI does not center in NAV/LOC modes Aircraft flies right or left of GPS course line in GPSS mode Symptoms HDG Bug does not center in HDG Mode 8. Slide 9: When it’s not a Roll “null” Centering Issue Usually the HDG bug is within 0-10 degrees of the lubber line if it is a roll null issue. Century Iii AutopilotIf the HDG bug is out of center more than this it is more likely a wiring issue or an ACU with a shorted HDG or CRS output. Autopilot Basics Symptom HDG Bug is more than 10° out of center when the yoke nulls in HDG Mode. 9 Causes R1 has not yet been adjusted for a 45° intercept angle (see Slides 12-17) Verify wiring between the ACU and the transformers is correct. Check radio coupler pin A for 0vrms when the HDG Bug is under the lubberline. Century Iii Autopilot Service Manual![]() If not 0vrms then the ACU HDG Datum (pin 22) output has gone bad. Make sure the wiring is not shorted and then replace the ACU. VG must be level (can be unplugged) during this test. Slide 10: 10 Aircraft must be in proper trim (rudder and aileron) Verify slip/skid ball is centered – if not, apply appropriate rudder command to center. If HDG bug is now centered no further action is required. (may look into adjusting rudder trim tab) Make small adjustments to autopilot roll “null” centering pot Allow 15 seconds or so for autopilot to settle Re-adjust pot as necessary, waiting 15s between adjustments, until HDG Bug is centered or aircraft is on course Autopilot Basics In Air - Roll “null” Centering Adjustments (Follow autopilot manufacturers’ instructions). Slide 11: Century II/III Radio Coupler R1 Alignment and Theory 11 Radio Coupler Computer AMP It is recommended that a pre-EFD1000 flight test be performed on the autopilot to verify acceptable operation Disclaimer – The following pages contain information that should only be used to align the ACU to the radio coupler and it assumes the radio coupler was properly aligned and functioning correctly prior to the EFD1000 installation. Follow all autopilot manufacturers instructions for any needed autopilot alignments or for autopilot return to service instructions. Slide 12: Three ways to align the ACU to the Radio Coupler Prior to removal of the DG/HSI you would measure the HDG Datum voltage (radio coupler pin A) when the HDG Bug is 90⁰ off of the lubber line. Adjust R1 so that the yoke is still. This may be the easiest option with the Century gyro substitution box. Adjust R1 to produce a 45⁰ intercept angle in “OMNI” mode. Instructions to follow. Century II/III - Alignment 12. Slide 13: Century II/III interface with Radio Couplers 1C388, 1C388M, 1C388MC, 1C388-C only HDG Datum input only, therefore HDG Bug controls HDG/NAV/OMNI/LOC Modes CRS Pointer position is irrelevant R1 is set for a 45⁰ intercept angle: Procedure: Century II/III - Alignment 3. Engage the autopilot in “OMNI” mode 2.
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