Aircra instrument systems Exam Ques ons and
answers | Updated Rated A+ | NEW 2026
What instruments in an aircra are connected to the sta c system?
The airspeed indicator, the ver cal speed indicator, and the al meter.
What types of repairs or altera ons can a cer ficated A&P mechanic make to aircra
instruments?
None. All repairs and altera ons must be made by the instrument manufacturer or by an FAA-
approved repair sta on cer ficated for the par cular instrument.
What is the significance of a red radial line on the dial of an aircra instrument?
A red radial line marks a never-exceed condi on.
What is the significance of a yellow arc on the dial of an aircra instrument?
A yellow arc marks a cau on range of opera on.
What is the significance of a green arc on the dial of an aircra instrument?
A green arc indicates the normal range of opera on
What is the significance of a white arc on the dial of an airspeed indicator?
A white arc on an airspeed indicator indicates the airspeeds at which the flaps may be lowered.
What is used to warn a mechanic that the glass on an aircra instrument that contains the
range marks has slipped?
A white slippage mark that extends across the lower part of the instrument cover glass and the
instrument case bezel shows whether or not the glass has slipped. A slipped glass would put the
range marks over the incorrect numbers.
Where can a mechanic find the range markings that are required on the instruments in a
par cular aircra ?
In the Type Cer ficate Data Sheets for the aircra .
What check must be made if a mechanic replaces any instrument that is connected to the
instrument sta c system?
The sta c system must be checked for leaks.
answers | Updated Rated A+ | NEW 2026
What instruments in an aircra are connected to the sta c system?
The airspeed indicator, the ver cal speed indicator, and the al meter.
What types of repairs or altera ons can a cer ficated A&P mechanic make to aircra
instruments?
None. All repairs and altera ons must be made by the instrument manufacturer or by an FAA-
approved repair sta on cer ficated for the par cular instrument.
What is the significance of a red radial line on the dial of an aircra instrument?
A red radial line marks a never-exceed condi on.
What is the significance of a yellow arc on the dial of an aircra instrument?
A yellow arc marks a cau on range of opera on.
What is the significance of a green arc on the dial of an aircra instrument?
A green arc indicates the normal range of opera on
What is the significance of a white arc on the dial of an airspeed indicator?
A white arc on an airspeed indicator indicates the airspeeds at which the flaps may be lowered.
What is used to warn a mechanic that the glass on an aircra instrument that contains the
range marks has slipped?
A white slippage mark that extends across the lower part of the instrument cover glass and the
instrument case bezel shows whether or not the glass has slipped. A slipped glass would put the
range marks over the incorrect numbers.
Where can a mechanic find the range markings that are required on the instruments in a
par cular aircra ?
In the Type Cer ficate Data Sheets for the aircra .
What check must be made if a mechanic replaces any instrument that is connected to the
instrument sta c system?
The sta c system must be checked for leaks.
