Avionics News October 2012 - 55
helps the pilot understand what those functions do.” There are some tricks that can help in troubleshooting autopilot problems. According to Weber, the flight director (on airplanes equipped with one, or with a glass panel that provides equivalent functionality) “is one of the most underused items in troubleshooting, and 75 percent of the time I’ll ask the pilot or another technician what the command bars are doing. If the command bars go left and the servo goes right, it’s a bad servo. If the command bars are trying to roll the airplane on its back,
it’s probably a problem with the attitude reference.” Evans said cable tension can be a special problem in business-class airplanes that operate at high altitudes. “You have thermal cycling, which can affect cable tension,” Evans said. “In the King Air and small jets, it’s not unusual to get pitch porpoising after about an hour at altitude. It’s a symptom of loose cable tension, which gets looser as the temperature drops. Set cable tension closer to the high end of the allowed range on the ground to eliminate trouble up high.
“Control surface friction also is an issue for autopilots. It’s a major limitation in some jets, where you’ll have to test control-system tension against yoke deflection. If there’s too much friction, the servo won’t be able to overcome it. I’ve had a customer complain about electric elevator trim, got in the airplane and found that it required a lot of force to move the yoke. In a situation like that, the safety clutch just slips. I told the customer he didn’t have an autopilot problem, he had a serious pitch trim problem.” q
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Avionics News October 2012
Table of Contents for the Digital Edition of Avionics News October 2012
Point of Communication
AEA Now
The View From Washington
International News and Regulatory Updates
Lightning Detection & Datalink
Member Profile
Cockpit Innovations
Member Profile
A Conversation With...
Understanding Autopilot Upgrades
Before & After
Member Profile
Pro-to-col
Business Basics
Theory & Practice
What's New
Marketplace Classifieds
Avionics News October 2012 - Intro
Avionics News October 2012 - Cover1
Avionics News October 2012 - Cover2
Avionics News October 2012 - 1
Avionics News October 2012 - 2
Avionics News October 2012 - 3
Avionics News October 2012 - Point of Communication
Avionics News October 2012 - 5
Avionics News October 2012 - AEA Now
Avionics News October 2012 - 7
Avionics News October 2012 - 8
Avionics News October 2012 - 9
Avionics News October 2012 - 10
Avionics News October 2012 - 11
Avionics News October 2012 - 12
Avionics News October 2012 - 13
Avionics News October 2012 - The View From Washington
Avionics News October 2012 - 15
Avionics News October 2012 - International News and Regulatory Updates
Avionics News October 2012 - 17
Avionics News October 2012 - 18
Avionics News October 2012 - 19
Avionics News October 2012 - Lightning Detection & Datalink
Avionics News October 2012 - 21
Avionics News October 2012 - 22
Avionics News October 2012 - 23
Avionics News October 2012 - 24
Avionics News October 2012 - 25
Avionics News October 2012 - 26
Avionics News October 2012 - 27
Avionics News October 2012 - Member Profile
Avionics News October 2012 - 29
Avionics News October 2012 - 30
Avionics News October 2012 - 31
Avionics News October 2012 - Cockpit Innovations
Avionics News October 2012 - 33
Avionics News October 2012 - 34
Avionics News October 2012 - 35
Avionics News October 2012 - 36
Avionics News October 2012 - 37
Avionics News October 2012 - 38
Avionics News October 2012 - 39
Avionics News October 2012 - Member Profile
Avionics News October 2012 - 41
Avionics News October 2012 - 42
Avionics News October 2012 - 43
Avionics News October 2012 - A Conversation With...
Avionics News October 2012 - 45
Avionics News October 2012 - Understanding Autopilot Upgrades
Avionics News October 2012 - 47
Avionics News October 2012 - 48
Avionics News October 2012 - 49
Avionics News October 2012 - 50
Avionics News October 2012 - 51
Avionics News October 2012 - 52
Avionics News October 2012 - 53
Avionics News October 2012 - 54
Avionics News October 2012 - 55
Avionics News October 2012 - Before & After
Avionics News October 2012 - 57
Avionics News October 2012 - Member Profile
Avionics News October 2012 - 59
Avionics News October 2012 - 60
Avionics News October 2012 - 61
Avionics News October 2012 - Pro-to-col
Avionics News October 2012 - 63
Avionics News October 2012 - 64
Avionics News October 2012 - 65
Avionics News October 2012 - Business Basics
Avionics News October 2012 - 67
Avionics News October 2012 - 68
Avionics News October 2012 - 69
Avionics News October 2012 - Theory & Practice
Avionics News October 2012 - 71
Avionics News October 2012 - 72
Avionics News October 2012 - 73
Avionics News October 2012 - What's New
Avionics News October 2012 - 75
Avionics News October 2012 - 76
Avionics News October 2012 - 77
Avionics News October 2012 - Marketplace Classifieds
Avionics News October 2012 - 79
Avionics News October 2012 - 80
Avionics News October 2012 - Cover3
Avionics News October 2012 - Cover4
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