Telex Airman 850 Operating Instructions Manual

Operating Instructions

Te l e x

®

Airman 850

General Description

The Telex Airman 850 is designed for use in aircraft with low noise levels.
Ambient noise levels in such aircraft cockpits may be considered harmful
when exposed to for long periods of time. In addition, these ambient noise
levels require pilots to increase communications volume level for clear
understandable communications. This increased communications level
adds to the harmful and fatiguing aircraft cockpit environment.

The Telex Airman 850 is ideally suited to this environment. Soft, pliable
cushions provide passive attenuation of unwanted background noise. The
advanced active noise reduction system removes even more noise in the
communications frequency range. This combination gives the Telex
Airman 850 a unique improvement in communications clarity and
intelligibility. With ambient noise reduced, communications levels can also
be reduced, providing less fatigue and an overall improvement in comfort.

Complimenting these noise reduction features is a durable, lightweight
design with adjustable sliders increasing long-term fit and comfort. A new
boom mounted microphone utilizes an electret noise-canceling element
for improved noise rejection. Extended response drivers improve sound
reproduction. The result is a comfortable, lightweight, headset that
provides the ultimate in clear, understandable communications with no
batteries or complicated controls to get in the way.

The Telex Airman 850 headset with boom microphone is approved for
aircraft use under FAA TSO’s C57a and C58a.

The conditions and tests required for the TSO approval of this article are
minimum performance standards. It is the responsibility of those
installing this article either on or within a specific type or class of aircraft
to determine that the aircraft installation conditions are within the TSO
standards. TSO articles may have separate approval for installation on
aircraft. The article may be installed only if performed under 14 CFR part
43 or the applicable airworthiness requirements.

This device complies with part 15 of the FCC
Rules, Operation is subject to the following two
conditions: (1) This device may not cause harm­ful interference, and (2) this device must accept
any interference received, including interference
that may cause undesired operation.

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FAA Technical Standard Order

The Telex Airman 850 headset including boom microphone is FAA TSO C57a
and C58a approved. Tests were conducted using RTCA DO-214 and RTCA
DO-160D. The headset was designed and is manufactured to meet the following
environmental categories.

Page 3

Flexible Boom Permits

Precise Mic Placement

Earcups Rotate

to Conform to

Wearer

Boom Rotates Overhead for

Mic Placement on Either

Side of Head

Figure 1

Airman 850 Reference View

(Dual-Sided Model Shown)

Noise Canceling

Electret Microphone

Sliders Adjust to

Any Size Head

Note: See Page 8 for Available Replacement Parts

Replaceable

Ear Cushions