David Clark M-5A Microphone at a Glance
Noise-canceling electret replacement microphone for compatible powered aviation headsets and professionally configured helicopter helmet communication systems.
- Manufacturer: David Clark
- Model: M-5A
- David Clark Part Number: 09168P-90
- Microphone Type: Electret
- Noise Canceling: Yes
- Power Requirement: Requires DC bias from a compatible communication circuit
- Product Includes: Microphone only
David Clark M-5A for Helicopter Helmet Communications
The David Clark M-5A is a noise-canceling electret microphone designed for clear voice transmission in compatible powered communication systems. It is used in David Clark high-noise communication equipment and may also be installed as a replacement microphone in properly configured aviation headsets and flight helmets.
In a helicopter helmet, replacing the microphone is not simply a matter of matching its size or shape. The M-5A must work with the microphone boom, electrical contacts, internal helmet wiring, communication cord, plug, aircraft intercom, and radio system.
This product is the individual M-5A microphone element. The rest of the helmet communication system must already be compatible or be professionally configured for this microphone.
Confirm the Microphone Before Ordering
The most reliable way to order the correct replacement is to identify the microphone already installed in the helmet or use the equipment parts information for the existing communication system.
Microphone model: M-5A
David Clark part number: 09168P-90
Similar-looking aviation microphones are not necessarily interchangeable. Other M-5, M-7, and military dynamic microphone models may have different electrical requirements, contacts, or intended applications.
The M-5A Requires a Powered Electret System
The M-5A is an electret microphone. It requires DC bias from a compatible communication circuit in order to operate correctly.
This distinction becomes especially important when repairing older flight helmets or helmets that were originally configured for military communications.
Important Compatibility Note: The David Clark M-5A is not a direct replacement for an M-2, M-87, DC-87, or another military low-impedance dynamic microphone. A communication-system conversion may require additional changes to wiring, earphones, cords, plugs, connectors, or other components.
M-5A Applications for Helicopter Pilots and Aircrew
When the helmet and aircraft communication system are correctly configured for an electret microphone, the M-5A may support communications in a variety of professional aviation environments.
- Helicopter EMS and air-medical operations
- Law-enforcement and public-safety aviation
- Utility, power-line, construction, and external-load operations
- Aerial firefighting and government aviation
- Tour, charter, offshore, and commercial helicopter operations
- Agricultural aviation and other high-noise cockpit environments
- Flight helmet repair, refurbishment, and civilian communication upgrades
The operating mission does not by itself determine compatibility. The actual helmet and aircraft communication configuration must still support the M-5A.
What Should You Check on the Helmet?
| Component | M-5A Compatibility Requirement |
|---|
| Microphone Boom | Must accept the M-5A microphone body and contact arrangement. |
| Electrical System | Must provide the DC bias required by an electret microphone. |
| Microphone Cord | Must match the microphone contacts, boom, and helmet or headset wiring. |
| Aircraft Connection | Helmet cord, plug, intercom, and radio must support the completed civilian electret system. |
Helmet brand alone does not establish compatibility. The complete communication configuration should be verified before changing microphone models.
David Clark M-5A Product Details
| Microphone Model | David Clark M-5A |
| David Clark Part Number | 09168P-90 |
| Microphone Type | Electret replacement microphone |
| Noise Canceling | Yes |
| Required System | Compatible powered electret microphone circuit |
| Documented David Clark Use | DC 3690 high-noise communication headset |
| Included | One M-5A microphone element |
| Compatible Protector | David Clark 40062G-02 |
| Direct Military Low-Impedance Replacement | No. It does not directly replace an M-87, DC-87, or M-2 dynamic microphone. |
M-5A vs. M-5B: Make Sure You Order the Correct Model
David Clark identifies the M-5A and M-5B as separate electret, noise-canceling microphone models. The similar names do not mean the two microphones should automatically be substituted for one another.
| Identification | M-5A | M-5B |
|---|
| David Clark Part Number | 09168P-90 | 09168P-85 |
| Microphone Type | Electret, noise canceling | Electret, noise canceling |
| Documented Product Use | DC 3690 and selected compatible communication assemblies | Newer David Clark systems including DC ONE-X and DC JET families |
| Interchangeable? | David Clark lists the M-5A and M-5B as different models and part numbers. Do not assume interchangeability without equipment-specific parts information. |
What Comes with the M-5A?
- One David Clark M-5A electret microphone
- David Clark part number 09168P-90
The flex boom, helmet mount, microphone cord, protector, earphones, main helmet cord, aircraft adapter, and installation service are not included unless separately selected.
Installation and Positioning in a Flight Helmet
Install the microphone with its speaking side facing the pilot or crew member. Position it close to the lips to support clear voice pickup and effective noise-canceling performance.
Microphone placement should also avoid unnecessary interference with the helmet visor, oxygen equipment, retention system, or other installed components.
Professional installation is recommended when the work requires soldering, contact replacement, rewiring, boom modification, connector changes, or conversion from a military low-impedance communication system.
Poor Transmit Audio Does Not Always Mean a Bad Microphone
If transmitted audio is weak, intermittent, distorted, or missing, replacing the microphone may solve the problem when the M-5A itself has failed. However, several other parts of a helicopter helmet communication system can create similar symptoms.
- M-5A microphone element
- Microphone boom and contacts
- Internal helmet wiring
- Microphone or main communication cord
- Plugs, connectors, and aircraft adapters
- Aircraft intercom or radio configuration
Checking the complete communication system can help identify the actual problem before replacing a serviceable microphone.
M-5A Flight Helmet Support from Helicopter Helmet
Helicopter Helmet works with complete aviation helmet communication systems rather than treating the microphone as an isolated component. Correct performance depends on the microphone, boom, earphones, internal wiring, helmet cord, aircraft connection, and intercom working together.
- Flight helmet repair and communication troubleshooting
- Microphone, boom, cord, and wiring support
- Assistance identifying civilian and military communication configurations
- Communication-system repairs and component installation
- Support for EMS, law enforcement, utility, firefighting, government, agricultural, and commercial aviation operators
David Clark M-5A Helicopter Helmet FAQs
Is the M-5A suitable for a helicopter flight helmet?
Yes, when the helmet uses a compatible M-5A boom, contact arrangement, wiring, communication cord, and powered electret communication system.
How do I know if the microphone in my helmet is an M-5A?
Check for the David Clark M-5A model designation or part number 09168P-90. If the existing microphone cannot be positively identified, the boom, wiring, cord, plug, and communication system may also need to be checked.
Does the M-5A need DC bias?
Yes. The M-5A is an electret microphone and requires DC bias from a compatible communication circuit.
Can I replace an M-87 with an M-5A?
Not as a direct replacement. The M-5A is an electret microphone, while the M-87 is used in a military low-impedance dynamic communication system. Conversion may require changes elsewhere in the helmet communication system.
Is the M-5A different from the M-5B?
Yes. David Clark identifies them as separate models. The M-5A is part number 09168P-90, while the M-5B is part number 09168P-85. They should not be assumed to be interchangeable.
Which protector is used with the M-5A?
David Clark protector 40062G-02 is identified for compatible non-coated M-5 and M-7 series microphone applications.
Is the M-5A waterproof?
The David Clark M-5A product information used for this listing does not identify part number 09168P-90 as waterproof or submersible. It should not be treated as waterproof without separate manufacturer documentation.
My transmit audio cuts out when I move the boom. Should I replace the M-5A?
Not necessarily. Intermittent audio can also be caused by the microphone contacts, boom wiring, internal helmet wiring, cords, connectors, or other parts of the communication system.
Can Helicopter Helmet help install or troubleshoot the M-5A?
Helicopter Helmet supports flight helmet repair and communication-system service. If the correct microphone or source of a communication problem is uncertain, provide the helmet model and information or photographs showing the existing microphone, boom, cord, plug, and aircraft connection.
