There will be over 135,000 documents in our Service Information Indexes.
If the SB that you need is not yet a link (or is not listed),
Contact Us. Please mention the AD No. in your message.
Most SBs are displayed in PDF format. (Use your Browser's 'Edit | Find' function to locate an SB by number.)
Technical Problem with the KCS 55 System whereby a Significant Heading Error can Quickly Develop, and Unless the Pilot Compares Against Another Heading Source such as Another Directional Gyro or Alcohol Compass, the Error may go Undetected
Technical Problem with the KCS 55 System whereby a Significant Heading Error can Quickly Develop, and Unless the Pilot Compares Against Another Heading Source such as Another Directional Gyro or Alcohol Compass, the Error may go Undetected