Your browser is not supported.

For the best experience, please access this site using the latest version of the following browsers:

Close This Window

By closing this window you acknowledge that your experience on this website may be degraded.

Greater Longevity and Reduced Unscheduled Removals with Honeywell Temperature Control Valve Upgrade for B737NG

To learn more or schedule an upgrade, please fill out the form below.

Operators have been experiencing unscheduled removals attributed to motor faults on the Temperature Control Valve (TCV) 398908-3 and 398908-5, with the rotary electro-mechanical actuator, PN 2740028-2. Honeywell investigations identified leakage around butterfly seal rings in the valve body and potential issues with switches and capacitors on this actuator causing the motor faults.

The new TCV upgrade includes a full valve overhaul (zero time). Replacing the actuator with the upgraded capacitor, bearings, seals and wiring improvements helps reduce delays and cancellations due to intermittent faults.


·      Improved reliability, reduced unscheduled events and increased service intervals on a zero-time unit

·      New -6 motor that is directly hardwired

·      Improved electrical retainer design