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Time to read 7 min
The David Clark H9935 headset is engineered for pilots who demand reliability and comfort in the cockpit. Its defining feature is the M-2H dynamic microphone, which operates at 5 Ohms to deliver clear audio even in high-noise environments. This makes it an ideal choice for pilots flying in aircraft with substantial ambient noise, as it ensures that communication remains crisp and intelligible.
In addition to its audio capabilities, the H9935 is equipped with undercut gel earseals that enhance comfort during extended flights. These earseals conform to the shape of the ear, providing a snug fit that minimizes pressure points. This is particularly beneficial for pilots who spend long hours in the cockpit, as it reduces fatigue and enhances overall comfort.
This guide covers everything you need to know about maintaining and upgrading your H9935 headset. From detailed parts lists to comfort upgrades and accessories, we've compiled all the information you need to keep your headset performing at its best. Whether you're looking to replace worn components or enhance your headset's comfort, this guide has you covered.
The H9935 is a robust aviation headset designed for demanding environments.
Features a dynamic M-2H microphone with 5 Ohm impedance for clear communication.
Compatible with a wide range of aircraft due to its versatile comm cord assembly.
The headset's undercut gel earseals provide enhanced comfort during long flights.
Shared parts with other models ensure easy access to replacements and upgrades.
Every part number in this guide is verified against the official David Clark IPC.
Table of contents
The H9935 relies on passive noise attenuation to deliver a quieter cockpit experience. This is achieved through its circumaural earcup design, which creates a sealed acoustic chamber around the ear. The earcups are lined with undercut gel earseals (part number 40863G-02) that provide a tight seal, effectively blocking out external noise.
Over time, the effectiveness of noise attenuation can degrade due to wear and tear on the earseals. Compressed or cracked seals can break the acoustic seal, reducing the headset's noise-blocking capability. If you notice an increase in ambient noise, replacing the earseals should be your first step in restoring optimal performance.
The David Clark H9935 and H9930 headsets are both designed for aviation use, but they cater to different needs. The H9935 features a dynamic M-2H microphone with 5 Ohm impedance, making it suitable for environments with high ambient noise. In contrast, the H9930 is a wireless model, offering the convenience of untethered communication.
When it comes to parts compatibility, the H9935 shares many components with other models, such as the undercut gel earseals (part number 40863G-02) and the headband spring (part number 15093P-01). This makes finding replacement parts straightforward, as many components are interchangeable across models.
If you prioritize clear communication in noisy environments, the H9935 is the better choice. However, if you value the freedom of wireless operation, consider the H9930.
Looking to make your David Clark H9935 even more comfortable? These two upgrades are customer favorites:
The Double-Foam Head Pad Kit enhances the H9935's comfort by providing extra cushioning. This upgrade is especially beneficial for pilots on long flights, as it reduces pressure on the head and improves overall wearability.
👉 Consider this upgrade if you experience discomfort during extended use.
The Comfort-Gel Undercut Ear Seals provide a snug fit that enhances noise isolation and comfort. These ear seals are perfect for reducing fatigue during long flights, as they conform to the shape of your ears.
👉 Upgrade to these ear seals for improved comfort and noise reduction.
Regular maintenance ensures your H9935 remains reliable and comfortable for every flight.
At Pilots HQ, we believe our job isn't finished when you buy a headset. We go further by offering:
👉 With Pilots HQ, you're not just buying products — you're investing in long-term comfort, clear communication, and confidence every time you fly.
To replace the earseals, remove the old ones and attach the new undercut gel earseals (40863G-02) by aligning them with the earcup.
Check the flex boom assembly (18740G-51) for secure attachment. If the issue persists, inspect the microphone M-2H (09168P-75) for damage.
Some parts like the undercut gel earseals (40863G-02) are compatible, but always verify specific part numbers for compatibility.
Replace the headpad assembly (40075G-02) when it shows signs of wear or discomfort, typically every 1-2 years depending on usage.
Increased noise could be due to worn earseals. Check and replace the undercut gel earseals (40863G-02) to restore noise attenuation.
Regularly inspect the comm cord assembly (40599G-98) for wear and ensure it's free from tangles to maintain optimal performance.
Pilots HQ Staff
At Pilots HQ, we’re more than just a store — we’re a crew of aviation enthusiasts and support staff dedicated to helping pilots and professionals get the gear and service they need. Our team shares insights, tips, and stories to keep you flying with confidence.
