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| The Bendix KFC 225 AUTOPILOT has one knob and twelve bottons (ten for the KAP 140). Most of functions are the same. | |
| Clicking areas | |
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| 1. Yaw damper ( if installed ) | |
| 2. AP on off | |
| 3. Flight director ( if installed ) | |
| 4, 5, 6, 7. AP programs: Heading hold, Nav, Approach, Backcourse | |
| 8. Acquire current altitude | |
| 9 and 14. Decreases / increases vertical speed | |
| 10 and 11. Decreases / increases altitude hold. Upper areas 1000 fpm, lower areas 100 fpm | |
| 12. Displays current vertical speed | |
| 13. Intercepts altitude selected (knob 10 / 11) | |
| Operation | |
| 2. AUTOPILOT ENGAGE/DISENGAGE (AP) BUTTON | |
| When pressed, engages the flight director, autopilot and yaw damper (if installed) - KAP 140 just the autopilot. If the flight director is not already engaged, the system will engage into the basic wings level (ROL) and pitch (PIT) attitude hold modes. The pitch attitude maintained will be the pitch attitude present at the moment of AP button press. When pressed again, will disengage the autopilot. | |
| 3. FLIGHT DIRECTOR ( FD ) MODE SELECTOR BUTTON | |
| When pressed will engage the flight director, if installed, into the basic roll (ROL) mode which functions as a wing leveler, and into the pitch attitude (PIT) hold mode, if it's not installed, it acts like AP button if AP is not active and has no effect in any other circumstances. The pitch attitude maintained will be the pitch attitude present at the moment of FD button press. When pressed again will disengage the flight director. | |
| 4. HEADING ( HDG ) MODE SELECTOR BUTTON | |
| When pressed, will engage the Heading mode, which commands the airplane to turn to and maintain the heading selected by the heading bug on the HSI. A new heading may be selected at any time and will result in the airplane turning to the new heading. Button can also be used to toggle between HDG and ROL modes. This button will engage the flight director, if installed. | |
| 5. NAVIGATION ( NAV ) MODE SELECTOR BUTTON | |
| When pressed, will arm the navigation mode. The mode provides automatic beam capture and tracking of VOR. NAV mode is recommended for en route navigation tracking. If pressed when NAV mode is either armed or coupled, will disengage the mode. This button will engage the flight director. | |
| 6. APPROACH ( APR ) MODE SELECTOR BUTTON | |
| When pressed, will arm the Approach mode. This mode provides automatic beam capture and tracking of or LOC with Glideslope (GS) on an ILS. APR ARM will annunciate. If pressed when APR mode is either armed or coupled, will disengage the mode. This button will engage the flight director. | |
| 7. BACK COURSE APPROACH ( REV ) MODE SELECTOR BUTTON | |
| When pressed, will select the back course approach mode. This mode functions similarly to the approach mode except that the autopilot response to LOC signals is reversed and glideslope is inhibited. This button will engage the flight director. | |
| 8. ALTITUDE HOLD ( ALT ) MODE SELECT BUTTON | |
| When pressed, will engage the Altitude Hold mode. The altitude maintained is the altitude at the moment the ALT button is pressed. If pressed when ALT hold mode is engaged, will disengage the mode, defaulting to PIT mode. This button will engage the flight director. | |
| 9 and 14. VERTICAL SPEED ( UP / DN ) BUTTONS | |
| The initial button press will bring up the commanded vertical speed in the display. Subsequent immediate button presses will increment the vertical speed command either up or down at the rate of 100 ft/min per button press. | |
| 10 and 11. ROTARY KNOB | |
| Used to set the altitude alerter/altitude preselect reference altitude. Changes reference by 100's of feet. If the flight director is engaged, will automatically arm a preselect altitude hold capture. | |
| 12. VERTICAL SPEED ( VS ) MODE SELECTOR BUTTON | |
| When pressed bring up the commanded vertical speed in the display. It doesn't capture VS in this version. | |
| 13. ALTITUDE ARM ( ARM ) BUTTON | |
| When pressed will toggle altitude arming on or off. When ALT ARM is annunciated, the automatic flight control system will capture the altitude displayed in the Altitude Alerter/Vertical Speed Display (providedthe aircraft is climbing or descending to the displayed altitude). Note that the alerter functions are independent of the arming process thus providing full time alerting, even when the flight director is disengaged. This button will engage the flight director. | |
| Display | |
| Here follows some AP explanation screenshots. | |
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AP active no program engaged |
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| Segment 1 displays the LNAV mode active, while segment 3 shows the mode armed if any. Altitude alert ( ALERT ) annunciation Illuminates as a solid alert in the region from 1000 to 200 feet from the selected altitude if the airplane was previously outside of this region. Flashes for a few seconds the when the airplane reaches the selected altitude. An aural alert is associated with the visual alerting. This aural alert occurs 1,000 feet before a selected altitude while approaching it and 200 feet after leaving a selected altitude, and when the altitude is reached. | |
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| Segment 2 n ormally displays the selected altitude. The display indicates the reference vertical speed in FPM for 3 seconds after the VS button or the UP or DN button is pressed. In the KAP 140 VS is replaced by BARO button which displays de baro pressure selected (in Hg or milibars). | |
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| Here below follows how the display changes in a tipycal sequence for an ILS approach. | |
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Before LOC interception |
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LOC intercepted GS armed |
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LOC and GS intercepted |
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