SM 26-15 (SM 16)
Aircraft lamp
Description
What is the SM 26-15 (SM 16) aircraft lamp?
SM 26-15 (SM 16) is a miniature incandescent lamp made for aircraft lighting, instrument illumination and light-signalling equipment. It is also found under the earlier designation SM 16. The designation identifies the electrical execution and must be checked in full when replacing an installed lamp. A visually similar bulb may have a different voltage, power, base or contact arrangement.
Full descriptionCollapse description
Electrical and light parameters
The rated operating point is 26 V and 15 W. Reference luminous flux is 142 lm. The published average operating life is 100 hours under the stated test conditions. These values describe the lamp itself; the brightness obtained in a panel, annunciator or luminaire also depends on the optical system and supply voltage. Operation above the rated voltage increases filament temperature and can sharply reduce service life. Select the rating from the equipment circuit, not from an approximate visual comparison of brightness.
Construction and installation
The clear glass envelope contains a mechanically supported tungsten filament. This execution uses a full-size miniature bayonet base, identified as B15d/18. The reference envelope dimensions are approximately 42 mm overall length and 22 mm maximum diameter. Before fitting, compare the holder, contact arrangement, available clearance and lamp seating. Do not force the glass envelope or modify the original socket to accept a different base.
Application and correct selection
SM-series lamps are used for internal illumination and signalling where compact size and resistance to aircraft vibration are required. Installation on a particular aircraft, helicopter, panel or instrument must be confirmed in the applicable illustrated parts catalogue or equipment documentation. Related SM lamps shown on this page are useful for navigation through the family and do not indicate interchangeability. When a passport or package label is available, compare every character, suffix and separator in the designation.
Ordering SM 26-15 (SM 16)
For a supply enquiry, state the full designation, required quantity, voltage, base or holder type and the marking of the lamp being replaced. A clear photograph of the removed lamp helps verify its contact arrangement. The minimum order quantity is shown in the product attributes. Other aircraft bulbs are available in the Aircraft Lamps category. General background is available in Aircraft lighting.
Technical details
- Product Type
- Miniature aircraft incandescent lamp
- Designation
- SM 26-15 (SM 16)
- Alternative Designation
- SM 16
- Rated Voltage
- 26 V
- Rated Power
- 15 W
All specificationsCollapse specifications
- Reference Luminous Flux
- 142 lm
- Average Operating Life
- 100 h
- Base Type
- B15d/18
- Overall Length
- 42 mm
- Maximum Diameter
- 22 mm
- Bulb Finish
- Clear
- Light Source
- Tungsten filament
- Function
- Internal illumination and light signalling
- Supply
- AC or DC only where permitted by equipment documentation
- Selection
- Verify designation, voltage, base and contact arrangement
Payment & delivery
Orders ship from our hub in Dubai. Partner stock is first transferred to Dubai, then shipped to you.
Dubai stock: 100% before dispatch. Partner stock (Remote stock) and Pre-order: 50% advance payment to start the order and 50% before shipment from Dubai to you.
Availability, lead time, delivery cost and payment terms are confirmed for your order before payment.
Payment & delivery terms