BS G 226:1979

This standard BS G 226:1979 Specification for counter and pointer, servo type, pressure altimeter systems is classified in these ICS categories:

• 49.090 On-board equipment and instruments

This British Standard specifies the general design and performance requirements for pressure altimeter systems having a combined counter and single pointer presentation in two forms as follows.

1. Type A. A panel-mounting indicator associated with its own internal or external pressure sensing mechanism.
2. Type B. As type A but incorporating an encoder for altitude reporting purposes.

Provision is made for instrument systems operating over an indicated range of − 2 000 ft to + 80 000 ft (geopotential) or such other range as may be declared.

The design includes a barometric pressure setting facility and may include provision for applying corrections for the aircraft static pressure system error.