PT9 Battery

The answer to TSO-C121b: BLUE90, the 90 days underwater locator beacon for aviation.

BLUE90 – the 90 days ULB. The minimum performance standards:

Dimensions installation/overall

  • Installation length: 3.845 inches (97.7mm)
  • Overall length: 3.920 inches (99.6mm)
  • Diameter: 1.300 inches (33mm)
  • Weight: 6.7 ounces (190g)

Operating Details

  • Actuation: Automatically by both, fresh and salt water, at all depths from 0.15 m (0.5 ft) to 6096 m (20000 ft) within 4 hours after immersion
  • Operating Depth:
    Surface to 6096 m (20000 ft)
  • Operating Temperature:
    –2°C (28°F) to +38°C (100°F)
  • Radiation Pattern:
    80% of a spherical pattern
  • Operating Frequency: 37.5 ± 1 kHz
  • Pulse Length: 9.0 ms minimum
  • Repetition Rate: 0.9 pulse/s minimum
  • Operating Life: 90 days

Acoustic Outputs on Activation

  • Initial Operation: 106 N/m2 (1060 dyne/cm2) r.m.s. (during the pulse) pressure normalized to 1 metre range, that is, at a level of 160.5 dB vs 1 μPa at 1 metre

Immediately after 90 days continuous operation

  • 70 N/m2 (700 dyne/cm2) r.m.s. (during the pulse) pressure normalized at 1 metre range that is, at a level of 157 dB vs 1 μPa at 1 metre

Tested to meet or exceed

  • TSO-C121b
  • ETSO-C142a

Transport benefit

  • Lithum content less than 1 gram
  • Non-restricted for transport
European Technical Standard Order
European Technical Standard Order