BULB (P/N 4537) - New Surplus

Part number 4537 is a miniature aircraft bulb for cockpit instrument panel illumination. This lamp conforms to military miniature standards MS25231 and appears on QPL-6363 manufacturer listings. The bulb operates at common aircraft voltages and installs in instrument post-light fixtures throughout the flight deck.

Before installation, verify the correct voltage rating, base type, and specification from your aircraft's Illustrated Parts Catalog to ensure compatibility with existing fixtures. Proper torque and seating per the applicable maintenance manual ensures reliable illumination during flight operations.

What is the BULB (P/N 4537)?

Part number 4537 is a miniature aircraft bulb for cockpit instrument panel illumination. This lamp conforms to military miniature standards MS25231 and appears on QPL-6363 manufacturer listings.

Is the 4537 a PMA or OEM part?

The BULB may be available as an OEM (Original Equipment Manufacturer) or PMA (Parts Manufacturer Approval) part depending on condition and source. Both carry FAA certification for airworthiness. Currently available in: New Surplus. Contact us for sourcing details.

Does the 4537 include installation hardware?

Installation hardware requirements vary by application. Check your aircraft's Structural Repair Manual (SRM) or Illustrated Parts Catalog (IPC) for the complete installation kit requirements for the BULB. We stock related hardware and can help identify companion parts.

Can the 4537 be shipped internationally?

Yes, we ship airframe components worldwide. International orders typically arrive within 3-14 business days depending on destination. Export documentation and customs forms are included. Contact us for international shipping quotes on the 4537.