This is for an Aircraft

Crash Survivable Memory Unit (CSMU)

Data Memory Flight Recorder

P/N:  171917-01-01

Model:  3251A

Maker: Smiths Industries

This unit is in excellent condition. I currently have several of these units in stock. You will receive this one or one in similar condition.  May show signs of wear from normal use.  I have one unit in a separate listing that has the underwater tracking beacon included.  The units in this listing do not come with the beacon.  I can make an even better deal if you buy multiples.  These units should be looked at or tested by a professional before installation.  It comes with a 30 day warranty (void if tamper stickers are broken).  International returns not accepted.   


  •   RS422 data input
  • Memory: 56K to 1,024K Bytes
  • Minimum Recording Time:


        - Attack/Fighter/Trainer Aircraft:

            15 Min. Active

            1 Hour Normal Flight

        - Transport Aircraft:

           25 Hours

  • Weight: 3.6 Pounds (1.64)


  • Size:
               H = 3.0 in (7.6 cm)

               W = 3.0 in (7.6 cm)

               L = 4.6 in (11.7 cm)

Power Dissipation:  <4 watts

Underwater locatable acoustic beacon available

Operational Requirements:

–Hard mountable in any location, any orientation

–No external cooling required

–Memory options for up to 25 hours of retained flight data

–Non-proprietary RS-422 interface for communication and download

Survivability: (TSO-C124 Compliant)

–Impact:1700g 6ms and 200g 15ms each face(3400g 6ms, 14.5g-sec - TSO)

–Penetration:500 lb. pin dropped 10 feet, each face

–Crushing force:5,000 lbs, 5 minutes each axis

–Fire:1,100°C. for 30 minutes

–Seawater immersion:(20,000 ft. for 30 days - TSO)

–Contact, immersion:Jet fuel, hydraulic & lubricating oil, etc.

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I ship fast, almost always same day