Additionally, the alignment procedure for the specific flight control system must be followed precisely. As noted in an official service bulletin, failure to align the system with a properly modded KI 256 can result in failure.
: A digital, three-axis Silver Crown Plus flight control system.
According to official BendixKing Downloads and Manuals , the KI 256 serves as the core attitude source for several legendary automatic flight control system (AFCS) suites:
: Internally air-driven (vacuum or pressure system required). Installation Procedures ki 256 installation manual
Before returning the aircraft to service, the requires these tests:
006-18256-00 Revision: 1.2 Applicability: KI 256 Flight Director Indicator (Electric Attitude Gyro)
Leave a service loop of at least 6 inches behind the connector for future maintenance. 4. Pneumatic Line Connection According to official BendixKing Downloads and Manuals ,
: If the gyro takes longer than 8–10 minutes to right itself, the bearings may be contaminated or the internal vanes sticky, necessitating an overhaul. Autopilot "Porpoising"
Cause: Broken excitation signal path or miswired pickoff reference lines. Fix: Check for 400 Hz AC voltage on Pins B and C.
Electrical items, including the KI 256, must be installed by a licensed repairman or installer to be eligible for any return policies. Always disconnect the aircraft’s battery before working on any electrical connection. Pneumatic Line Connection : If the gyro takes
Once the mechanical and electrical connections are secure, the system requires bench testing and in-flight adjustment. Ground Alignment Check
: This instrument is highly sensitive. It should never be subjected to more than
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