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.
Page 1
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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
Page 4
Design Features (See Figure 1)
Fit and Comfort
An adjustable headband gives the wearer two inches (51mm) of up and down
earphone adjustment per side, while the gimbal mounting improves the
headset’s side-to-side comfort.
Boom Microphone
The Airman 850 features a miniature, amplified, noise canceling electret
microphone that provides superior 400 Hz hum rejection. The microphone
is mounted on a flexible gooseneck boom that permits precise microphone
placement. The boom rotates 320° to allow the microphone to be worn on
either side of the head. For best results, the microphone should be placed
as close to the mouth as possible. The microphone includes a replaceable
windscreen to minimize popping, hissing, and breathing sounds when
speaking.
Controls
The Airman 850 contains an On/Off switch to control ANR power and a Hi/
Low switch for controlling receiver volume.
Cordage and Plugs
The microphone cordage is protected inside the boom. A strain relief on the
cord provides maximum durability. Shielded wire throughout the headset
protects against RFI (Radio Frequency Interference) and EMI (Electro
Magnetic Interference).
Headset Operation
1. Connect the headset as shown in Figure 2.
2. Rotate the entire boom overhead to wear the microphone on either
the right or left side of the head (Note the two stops below the boom
housing).
3. With the Airman 850 resting securely on top of the head, check that
the earphone housings are centered over the ears. Maximum
performance depends on the proper fit of the headset.
4. For best noise cancellation, position the microphone as close to the
mouth as possible and speak in a normal voice.
5. To activate the Active Noise Reduction feature, move the “On/Off”
switch to the “On” position (See Figure 3). The active noise reduction
feature of this headset uses power obtained from the aircraft through
the boom microphone connection. Active noise reduction will only
function when power is received from the microphone connection.
There are many different communications systems in use today and
most systems can be configured for this type of use. each system
can be configured differently. When determining proper system
configuration, select an operational mode that provides constant power
to the boom microphone. If in doubt consult the avionics equipment
manufacturer or qualified avionics technician.
When conditions allow for boom microphone power only during
push-to-talk, it may be preferred to keep the ANR power switch in
the “off” position.
6. When required, the user may increase headphone volume level by
moving the volume “HI/LOW” switch to the “HI” position (See figure
3). The “low” position is considered normal. The Airman 850 should
function properly with most avionics equipment when used in the “low”
position.
Page 5
Figure 2
Headset Connections
Connectors used on 301317-000, 301317-300 and 301317-003
Connector used on
301317-002
Connector used on
301317-001
Page 6
Volume
Control
Figure 3
Volume Adjustment/ANR Switch
ANR
Switch
Microphone Gain Adjustment
The microphone gain has been factory-adjusted to the nominal level required
for normal radio operation. Under normal circumstances microphone gain
does not require adjustment. If needed, adjustment by a qualified avionics
technician is recommended. To access the microphone gain, insert a 1.5mm
flat head screwdriver through the access hole in the microphone housing
(See Figure 4). Clockwise rotation increases the microphone gain.
Figure 4
Microphone Gain Adjustment
Note: There is a hole on both
sides of the microphone
housing. One is blocked by
foam. Do not use the side
blocked by foam.
Gain
Adjustment
Page 7
Specifications
Receivers:
Type: Dynamic
Impedance:
301317-000, 301317-001: 150 ohms +/-20% @ 1kHz
301317-002 and 301317-003: 600 ohms +/-20% @ 1kHz
301317-300: 300 ohms +/-20% @ 1kHz
Note - Damage could occur to avionics equipment by the use of this headset if the
equipment was manufactured for use with 600 ohm headsets only. If in doubt,
consult the avionics equipment manufacturer.
Frequency Response: 350 Hz - 3 kHz
Sensitivity: Volume selector in “Low” 90 dB +/- 5dB (1 kHz, 1 mW input)
Microphone and Amplifier:
Element Type: Noise-canceling amplified electret
Matching Impedance: 50-600 ohms
Frequency Response: 300 Hz - 6000 Hz (Per RTCA DO-214)
Sensitivity:
400mV+/-6dB (at 1kHz, 12VDC, 470 ohm DC/150 ohm AC load)
Operating Voltage: 8-28 Vdc (470 ohm load)
ANR:
Receives power from boom microphone connection.
Provides up to 12dB of attenuation between 100 and 2000 Hz.
Plug Type (301317-000, 301317-300, 301317-003):
Microphone Plug: PJ-068 or equivalent
Reciever Plug: PJ-055 or equivalent
Plug Type (301317-001):
Microphone Plug: Single PJ-068
Plug Type (301317-002):
Microphone Plug: Single XLR Connector
Reciever Plug: 5-Contact Male
Gross Weight:
3.8 oz. (107.7 g) without cord (dual-sided models)
2.85 oz. (80.7 g) without cord (single-sided models)
Cord Length (301317-000, 301317-001, 301317-300, 301317-003):
5.5 ft +/-0.5 ft (1.7 m +/- 0.15 m)
Cord Length (301317-002):
6.5 ft +/-0.5 ft (1.9 m +/- 0.15 m)
Color:
Black
Controls:
Active Noise Reduction “On/Off” Switch
Volume “Hi/Low” Switch
Page 8
Part Number Information
Airman 850 Headset ........................................... Catalog no. 301317-000
Airman 850 Headset w/Single PJ-068 ................ Catalog no. 301317-001
Airman 850 Headset w/XLR Connector ................ Catalog no. 301317-002
Airman 850 Headset, 600 Ohm ........................... Catalog no. 301317-003
Airman 850 Headset Single-Sided ....................... Catalog no. 301317-300
Replacement Ear Cushions ................................ Catalog no. 800456-020
Replacement Windscreen .................................. Catalog no. 800456-019
Replacement Clothing Clip ................................. Catalog no. 590637-000
For a Dealer Near You,
Telephone: 877-863-4168
Website: www.telex.com/aircraft
Page 9
LIMITED WARRANTY — VALID ONLY IN UNITED STATES AND
CANADA
Bosch Security Systems, Inc. warrants to the user, who originally purchased the product
delivered with this card, that the product will be free from defects in material and workmanship
for the following periods after such date of purchase: Material 36 months, workmanship 36
months. Bosch will, at its option, repair or replace, free of charge, such defective products
subject to the following conditions:
1. Delivery of the product or parts postage prepaid to the Bosch dealer, authorized
service facility or factory.
2. Determination by Bosch that a defect exists and is covered by the limited warranty.
Defects due to alteration, repair by an unauthorized person, insertion of non-Bosch
parts, misuse, accidental damage, use of the equipment for purposes other than those
for which it was designed, and the like, are not covered by this limited warranty and
repairs thereof will be subject to normal service charges.
3. Repairs and replacement parts are covered under this limited warranty only for the
unexpired term of the original limited warranty.
4. Products purchased from unauthorized dealers are not warranted.
5. You must fill out and return the attached registration card within 10 days after such
purchase or this limited warranty is void.
THIS LIMITED WARRANTY IS EXPRESSLY IN LIEU OF ANY EXPRESS OR IMPLIED
WARRANTY, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE WHICH EXTENDS BEYOND THE TERM HEREOF. THE
REMEDIES PROVIDED BY THIS LIMITED WARRANTY ARE THE ONLY REMEDIES
AVAILABLE TO ANY PERSON. NO PERSON HAS ANY AUTHORITY TO BIND BOSCH TO
ANY REPRESENTATION OR WARRANTY OTHER THAN THOSE PROVIDED BY THIS
LIMITED WARRANTY. BOSCH SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES CAUSED BY FAILURE OR OTHERWISE OF THE PRODUCT.
Some states do not allow exclusions or limitations of incidental or consequential damages or
limitations on how long an implied warranty lasts, so the limitations or exclusions herein may
not apply to you. This warranty gives you specific legal rights, and you may also have other
rights which vary from state to state.
Page 10
CUSTOMER SERVICE
For information or technical assistance, call or write to Telex at:
Customer Service Department
Bosch Security Systems, Inc.
8601 E. Cornhusker Hwy
Lincoln, NE U.S.A.
(800) 553-5992
When returning equipment for repair, please enclose an explanation of
the problem. If the equipment is covered under warranty, please enclose
a copy of your proof of purchase. The equipment must be accompanied
by documentation stating your name, return address, and telephone
number.
Return equipment for factory repair to:
Customer Service Department
Bosch Security Systems, Inc.
8601 E. Cornhusker Hwy
Lincoln, NE U.S.A.
(402) 467-5321 or (800) 218-2410
Warranty Repairs - If in warranty, no charge will be made for the repairs.
Equipment being returned for warranty repair must be sent prepaid and
will be returned prepaid.
Non-Warranty Repairs - Equipment that is not under warranty must be
sent prepaid to Bosch. If requested, an estimate of repair costs will be
issued prior to service. Once your approval for repair, and repair of
equipment is completed, the equipment will be returned on a collect basis.
Collect charges may be avoided by sending a signed check for payment in
full along with your signed estimate approval form (the estimate includes
the shipping charge).
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