SM 7.5-9 (STs-88)
aircraft lamp
Description
What is the SM 7.5-9 (STs-88) lamp?
SM 7.5-9 (STs-88) is a clear aircraft incandescent lamp for compatible onboard lighting and indication equipment. Its designation identifies a rated voltage of 7.5 V and rated power of 9 W. The lamp is documented as a contour-light source on Mi-8 helicopters and is also used in compatible cabin and signalling lighting. Selection must follow the complete lamp marking and the equipment documentation.
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Electrical and light characteristics
Reference data specify a luminous flux of 50 lm and a service-life figure of 250 hours at the rated operating point. The transparent envelope provides uncoloured light. Voltage outside the specified value changes filament temperature, light output and life, so the lamp must be matched to the intended circuit rather than chosen by appearance.
Construction and installation
The lamp uses a B15d/18 base and has reference dimensions of 51 × 26 mm. The clear glass envelope, filament supports, contact arrangement and locating pins or base profile are part of its identification. Similar SM lamps can have different contacts and ratings. Installation should be made with power removed and without forcing the glass or base into the holder.
Identification and related lamps
Check the complete designation, voltage, power, base and dimensions before ordering. Nearby catalogue positions include SM 6.3-1.4, SM 6.3-1.6 (SM 34), SM 13-10, SM 13-15; they support comparison within the aircraft-lamp family and do not indicate interchangeability. The general operating principle is described in the incandescent lamp reference.
Inspection and ordering
Before installation, inspect the envelope, filament, base, contacts and locking features. Do not use a lamp with cracked glass, a loose base or damaged contacts. An enquiry should state SM 7.5-9 (STs-88), required quantity, equipment or holder type and document requirements. A photograph of the existing lamp or package helps confirm the correct execution.
Technical details
- Product type
- Aircraft incandescent lamp
- Designation
- SM 7.5-9 (STs-88)
- Rated voltage
- 7.5 V
- Rated power
- 9 W
- Luminous flux
- 50 lm
All specificationsCollapse specifications
- Reference service life
- 250 h
- Base
- B15d/18
- Reference dimensions
- 51 × 26 mm
- Bulb
- Clear glass
- Operating position
- Any
- Selection rule
- By full marking and equipment documentation
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