KFC2. 25 Autopilot Failures. Honeywell KFC2. 25 Autopilot Failures. When compared with traditional GA autopilots, the KFC2. It is almost totally digital internally and. GA autopilot issues of control instability caused by. However, during its brief life as an OEM- installed item (it never found a retrofit. This article was originally written in 2. Socata. TB2. 0GT aircraft which I have owned since 2. TB2. 0s manufactured. Most other KFC2. 25 users, in all airframes (Socata, Beech. Cessna, Piper, Diamond, etc) which used this autopilot, have also reported multiple. I have been trying to collate these to see if there is a pattern. Following some bench investigation of failed servos I have re- written this. August 2. 01. 2. Honeywell are aware of this site and of the issues and have been since around. They pretend the issue does not exist. Diary of KFC2. 25 Failures. Up to April 2. 00. In my TB2. 0GT, the KFC2. The pitch failures. The Socata TB2. 0GT aircraft was purchased new in May 2. The first failure in 8/2. I made a. huge fuss and the entire KFC2. Air Touring Ltd - now defunct). This type of failure would invert the aircraft. IMC. This failure. I did not witness personally. Then there were various failures where the AP randomly selected a +2. This figure was actually being loaded, during level. VS register which appears when the VS button is pressed. No. fault indication appeared on the AP computer display. The KFC2. 25 computer was. I know the servos. Then there were failures where it failed to hold altitude; the appearance being. GPS altitude all agreed. The aircraft remained in trim. Again, no fault condition. These were never fixed because they could not be reproduced. AP was disengaged and immediately re- engaged. A failure. to hold altitude is thus usually a failure of the internal barometer. But the. mechanism for the automatic 2. VS selection is a mystery; most likely a. Then there were failures where the AP would disconnect, illuminating the P. R LEDs, these indicating servo failure. A re- engagement of the AP would return. This. was captured on video. The servo(s) were replaced at this point. The recent two failures, both taking place within a few weeks, appear to both. Bendix King Kfc 225 Autopilot Manual bendix/ king & s-tec autopilot computer - sun massey ferguson 1246 bendix / king kap140 european exploration colonization study guide answers autopilot - flightgear wiki autopilot repair - manual magic mountain physics day. BENDIX KING KFC 225 INSTALLATION MANUAL - yq9csbook.manualsbook.ddns.me download new and used autopilot components king s tec century pdf AP fails to control the aircraft in roll. Luckily. this one was captured well on a video, and the mpeg file shows the most recent. The roll servo was replaced after the first instance, and this article. Roll failure 1. 2- 0. MB)Note that the flight director does work correctly, so it cannot be an autopilot. This is a typical manifestation of a servo failure. However. the really disturbing thing is that the KFC2. Download and Read Bendix King Kfc 225 Installation Bendix King Kfc 225 Installation Title Type bendix king khf 950 installation manual PDF bendix king kfc 225 installation manual PDF bendix king kma 24h installation manual PDF bendix king kt 78 transponder. Download and Read Bendix King Kfc 225 Installation Bendix King Kfc 225 Installation Title Type bendix king khf 950 installation manual PDF bendix king kx 125 installation manual PDF bendix king kma 24h installation manual PDF bendix king kfc 225 installation. Browse and Read Bendix King Kfc 225 Installation Bendix King Kfc 225 Installation Title Type bendix king khf 950 installation manual PDF bendix king kfc 225 installation manual PDF bendix king kma 24h installation manual PDF bendix king kt 78 transponder. Browse and Download Bendix King Kfc 225 Installation Bendix King Kfc 225 Installation Title Type bendix king kma 24h installation manual PDF bendix king khf 950 installation manual PDF bendix king kfc 225 installation manual PDF bendix king kt 78 transponder. PDF File: Bendix King Kfc 225 Installation Manual - CHOM-83PDF-BKK2IM 2/4 Bendix King Kfc 225 Installation Manual This Bendix King Kfc 225 Installation Manual Pdf file begin with Intro, Brief Discussion until the Index/Glossary page, look at the table of content. Why. doesn't the software detect the fact that the roll servo is being energised. Due to the beat between the KFC2. KFC2. 25 display doesn't show up well in the video, but it does show. June 2. 00. 4The failure in the above video was caused by a faulty roll servo, whose internal. Amazingly, in this case, the KFC2. It is also apparent that a previous. I did some investigations on the failed servo, detailed here. There has been another failure since, in altitude hold. The KC2. 25 autopilot. Up to this point, Honeywell offered me an indefinite warranty on the KFC2. There is a firmware bug in the KFC2. It is possible, through pressing buttons. ALT (without any. ALT ARM) but in fact does not hold altitude but is probably. VS mode with a VS value of zero. This bug seems to have been fixed in. I had not seen it later - 2. September 2. 00. 5This video (1. MB. mpeg) shows another roll servo failure. This is like one I got in 2. KFC2. 25 passes it's power up tests despite the roll servo being dead. In 2. 00. 4 I saw an email from Honeywell to one of their dealers confirming this. This is appalling. Honeywell KFC2. 25 brochure states. Download and Read Bendix King Kfc 225 Installation Bendix King Kfc 225 Installation Title Type bendix king kma 24h installation manual PDF bendix king kfc 225 installation manual PDF bendix king kx 125 installation manual PDF installation guide bendix king kmd. Superb Safety Features. Honeywell’s avionics engineers built impressive safety features into the. KFC 2. 25. For example, the new KS 2. XC servos used for pitch, roll and pitch. Well- placed. voice messages and audible warnings keep pilots alert to the environment around. When the system is powered up, an extensive pre- flight test automatically. After some. seconds, one notices that the VS reading on the VSI is not quite - 5. I have asked Honeywell what kind of external problem. AP to self- modify the target VS but no meaningful response was. Occassionally the AP modifies the preset VS value even within the. VS figure appears, before it reverts to its. It is normal for the KC2. PDF File: Bendix King Kfc 225 Autopilot Manual - BKK2AM-18-WWRG6-PDF 2/4 Bendix King Kfc 225 Autopilot Manual INTRODUCTION This particular Bendix King Kfc 225 Autopilot Manual PDF start with Introduction, Brief Session till the Index/Glossary page. VS by +/- 1. 00fpm. Usually it modifies it downwards so e. Normally this is not a problem in real flying. KFC2. 25 is likely to drop this by 1. So you preset +2. OK if this. gets modified to +1. OK if it gets left alone because one cannot. So, a better way to climb to these altitudes. PIT (pitch hold) mode, instead of the VS mode, and adjust the. On this occassion, Honeywell contracted a UK avionics shop to examine the whole. A number of items (in addition to the faulty roll servo) were supposedly. November 2. 00. 7The autopilot has failed again, this time with a burning smell in the cockpit. SERVO circuit breaker popping. This time it was a faulty. KS2. 70. C pitch servo. Honeywell now washed their hands of their previous . That was not actually. I did not have a record of the details. What probably happened. Socata's pipeline. Honeywell's database. Soon afterwards, Honeywell washed their hands of any. The servo burning out issue was claimed to have been solved with the following. KS2. 70. C - Pitch Servo - Mod 8 dated Feb 0. KS2. 71. C - Roll Servo - Mod 9 dated Aug 0. KS2. 72. C - Pitch Trim Servo - Mod 7 dated Aug 0. The servo in question was installed in November 2. However, on 4/1. 2/2. Honeywell has access to export controlled documents. The current. status is. KS2. 70. C - Pitch Servo - Mod 9 dated Feb 0. KS2. 71. C - Roll Servo - Mod 1. Feb 0. 60. 65- 0. KS2. 72. C - Pitch Trim Servo - Mod 7 dated Aug 0. The above mod versions were confirmed current 3/2. However, there is no indication that the above mods to anything useful. In 2. 01. 1 the roll servo acquired the dubious SB1. Mod 1. 1) which makes matters much worse (see notes below). The burnt out pitch servo was opened and immediately the burnt out components. Component A (a large surface mount power resistor used for current sensing. Component B (an inductor) also became. The complete PCB is coated with a hand applied conformal. There was considerable amount of black soot (from brush. Note the attachment of a large weight on the motor/gearbox. This assembly is free to rotate by a few degrees - this is necessary. Evidently Honeywell had problems with. April 2. 00. 8The autopilot has failed again, again when airborne but thereafter consistently. The simplest scenario for reproducing this is on the ground, with the engine. AP completes its 1. In this state, the electric trim (only). However, as soon as the pitch trim (on the yoke) is operated. This condition cannot be terminated. AP using the autopilot master switch. An alternative scenario is with the engine running, when in principle one should. AP is also OK. However, the autopilot. The pitch trim does not work (never moves) and when it is eventually. The following video shows the three. Video (3. 7MB. WMV)Amusingly (or not) the KFC2. Superficially this looks like a pitch trim fault but the electric pitch. The motor/gearbox assembly in the pitch servo has. The signal from the 4 strain gauges (which are arranged as a bridge, for temperature compensation) is amplified by two INA1. V and vary from +2. V to +4. V under operation) are. KC2. 25 computer which then generates a pitch trim signal to the pitch. It was immediately found that the torque output from the pitch servo was duff. Either the strain gauge(s) failed or one of the two INA- 1. The servo was still under a 6 month warranty from the U. S. Honeywell dealer. Honeywell's report confirmed. September 2. 00. 8 - with an amazing discovery!! The autopilot has failed again, with the servo CB popping and a burning smell. This time, on the ground, the 5. A CB pops 2- 3 seconds. The fault is again in the pitch servo. KS2. 70. C, which was installed only 5 months ago. However, I had the GPS track for this flight and this failure led to an astonishing. France as the November. I also happened to have kept the GPS track. The. GPS track shows the altitude and one can easily tell when the autopilot failed. The failure happened just north of Le Mans. This map. shows the aircraft track in RED, and the location of the failure in YELLOW. The altitude plot from. In both of the above failures, the GPS position, as closely as one can tell. Lat 4. 8. 1. 51. 29 degrees NLong 0. EObviously this is not a coincidence and the only possible explanation is a. EMC (electromagnetic compatibility). Another autopilot failure happened in August 2. EGKA- LFBT, at about 5. I. no longer have the routing for that flight. This makes a total of three pitch. France. This is particularly significant. Nothing. is marked on the aviation chart at the very spot, although one wonders what. LF(D) 5. 74 A/B danger area. Possibly there is an anti- aircraft. This is a low frequency communications system operated by the French. February 2. 00. 9The KFC2. I had used the autopilot. I turned off the AP master switch, and after a. It passed the normal 1. I noticed. that while the AP was holding altitude and heading (the heading bug worked). For example, if holding altitude. This. is a particularly nasty failure mode because you can end up with a badly mis- trimmed. AP disconnect - pitch up or down violently. However. manual pitch trim (the yoke switch, working through the KC2. OK so. this wasn't a simple failure of the pitch trim servo. Subsequent tests found that, most of the time, the AP failed to do the power- up. P R LEDs and the P/T annunciator symbol (within the display. ON, and there was a continuous beep. Pressing. the red disconnect button ended the beep but did nothing else. Very occassionally. As I now have a complete set of spare servos and a couple of spare KC2. So, it had to be something in the wiring or perhaps. It proved impossible to find an avionics shop able to look at it within a reasonable.
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