Product Description

This part is a miniature incandescent lamp used as a low-power indicator and illumination source in 28 volt systems. It supports applications such as aircraft indicators, instrument lighting, and similar signal or status displays where a compact bulb is required.

0 1. Overview

Lamp 334 uses a tubular T1.75 (T-1 3/4) glass envelope with a single-contact midget groove base designated S5.7s. It operates at 28 volts with a current of approximately 0.04 amps in service. The bulb diameter is about 0.23 inches and the overall length is about 0.63 inches, providing a small form factor for tight mounting locations.

The construction uses an incandescent C-2F filament. Rated life is about 4000 hours, and luminous output is specified around 4 to 4.27 lumens with an MSCP value of approximately 0.34 candlepower. The glass is clear in the standard version, and the lamp is described as single contact.

This lamp is associated with multiple aircraft uses, including indicators and instrument post lights, and it is referenced for business jets such as the Hawker Beechcraft Hawker 800, 850XP, and 900XP. Cross-referenced or related designations include Eiko 40606, GE 28588, CM334, CM334-ND, S334, E-334, GE334, JKL334, DR-334, Satco S7116, Carley CL70279, Osram 35205, Orbitec OR 334, and the NSN 6240-00-295-1617.

0 2. Key Features

  • Miniature incandescent indicator lamp for 28 volt systems
  • Single-contact midget groove base S5.7s
  • Tubular T1.75 (T-1 3/4) glass envelope
  • Operating current approximately 0.04 amps at 28 volts
  • Approximate overall length 0.63 inches
  • Approximate bulb diameter 0.23 inches
  • C-2F filament construction
  • Rated life about 4000 hours
  • Luminous output around 4 to 4.27 lumens
  • Clear glass version with single-contact configuration
  • Used in aircraft indicators and instrument post lighting
  • Referenced on Hawker Beechcraft Hawker 800, 850XP, and 900XP aircraft
  • Associated NSN 6240-00-295-1617
  • Multiple industry cross-reference codes including GE 28588 and Eiko 40606
0 3. Specifications

Part number: 334
Lamp type: Incandescent miniature lamp
System voltage: 28 V
Operating current: 0.04 A (40 mA)
Bulb shape: T1.75 (T-1 3/4)
Bulb material: Glass
Bulb color: Clear
Base type: Midget groove, S5.7s, single contact
Filament type: C-2F
Approximate overall length: 0.63 in (16 mm)
Approximate bulb diameter: 0.23 in (5.9 mm)
Light center length: 0.38 in (9.6 mm)
Rated life: about 4000 hours
Luminous output: about 4–4.27 lumens
MSCP: approximately 0.34 candlepower
Typical applications: Aircraft indicators, instrument post lights, elevators and other indicator uses
Aircraft models referenced: Hawker Beechcraft Hawker 800; Hawker Beechcraft Hawker 850XP; Hawker Beechcraft Hawker 900XP
Associated NSN: 6240-00-295-1617
Related or cross-reference designations: Eiko 40606; GE 28588; CM334; CM334-ND; S334; E-334; GE334; JKL334; DR-334; Satco S7116; Carley CL70279; Osram 35205; Orbitec OR 334

FAQs

01. What electrical rating does the 334 lamp have in 28 volt service?

The 334 lamp operates at 28 volts with a current of approximately 0.04 amps.

02. What base style is used on the 334 lamp?

The 334 lamp uses a single-contact midget groove base designated S5.7s.

03. What are the approximate dimensions of the 334 lamp?

The 334 lamp has an overall length of about 0.63 inches and a bulb diameter of about 0.23 inches.

04. How long is the rated service life of the 334 lamp?

The 334 lamp has a rated life of about 4000 hours.

05. Which aircraft applications reference the 334 lamp?

The 334 lamp is referenced for aircraft indicators and instrument post lighting, including use on Hawker Beechcraft Hawker 800, 850XP, and 900XP aircraft.

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