July 13, 2026
No one knows everything, and aviation systems constantly evolve. A lack of knowledge becomes hazardous when individuals assume instead of asking questions or verifying information. Relying on outdated information, guessing at procedures, or skipping manual references can lead to serious errors. Regulations require training, maintaining currency, and using approved data to protect everyone involved. Admitting you don’t know is a strength, not a weakness. Failing to seek knowledge can cost you your certification, your job, and potentially lives—including those of your coworkers, passengers, and family members who trust the aviation system.
A lack of knowledge or an incomplete understanding of aircraft systems has been a recurring factor in aviation mishaps. For example, the investigation into American Airlines Flight 587, identifies misunderstandings about aircraft behavior and control inputs contributed to structural failure. In maintenance, assumptions or incomplete system knowledge or relying on assumptions instead of manuals can be just as dangerous. Regulations require training, maintaining currency, and using approved data to prevent these risks.
Recent events reinforce this lesson. The investigation into Alaska Airlines Flight 1282 (737 MAX 9) highlighted failures involving the installation and verification of the door plug. Other maintenance events, such as the cross-connection of wheel speed tachometer wiring on United Airlines Flight 267 (A320), demonstrate how inadequate system knowledge or failure to verify work can create significant safety hazards.
If you’re unsure—stop and ask. Use the approved maintenance manual, verify the procedure, and never rely on memory or assumptions. Guessing has no place in aircraft maintenance.
What it Looks Like
Assuming instead of verifying
Aircraft systems evolve, maintenance procedures change, and memory fades. Performing work from memory instead of consulting approved maintenance data can result in incorrect installations or missed steps.
AMT Focus
If you're not 100% sure, stop and look it up. Using approved maintenance data isn't optional—it's a professional responsibility and a regulatory requirement. Never let assumptions replace knowledge.
