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Data Acquisition Storage Unit (DASU)

Product overview

The L3Harris DASU is a combination of an aircraft data and voice recorder and data acquisition unit specifically designed for aircraft Health & Usage Monitoring System (HUMS) programs. It enables an easy, reliable solution for technicians to quickly access and address aircraft health before it becomes an issue. The DASU provides up to up to 240 MB of crash-protected memory and 1 GB of maintenance memory. When accurate, detailed information about an aircraft incident and accident investigation is needed, operators choose the DASU as a critical tool.

  • 4 audio channels in accordance with ED-112
  • 8 ARINC 429 inputs
  • 2-strain gauge inputs with 4 excitation outputs
  • 12 analog inputs
  • Ethernet GSE (Generic Stream Encapsulation) interface

Key Features

HUMS addresses aircraft stress, strain

To help ensure that an aircraft is operating effectively, the DASU employs an aircraft Health & Usage Monitoring System (HUMS) program. The DASU collects aircraft flight and performance data from multiple digital data bus and analog, discrete and strain gauge inputs. By applying algorithms stored in the DASU working memory, the data from these sources is processed to identify whether the aircraft system and sub-system components, including the airframe itself, may require maintenance due to abnormal stress, fatigue and/or failure.


Data aids maintenance decisions

Once data is processed, maintenance personnel download it to laptop-based line test equipment for analysis. The comprehensive data is then available for maintenance experts to initiate the needed maintenance action or actions. This processed data, and pilot cockpit voice data, are stored in a Crash-Survivable Memory Unit (CSMU), which is integrated with the DASU.

Product specifications


Height: 7.5 in. (19.05 cm)
Width: 5.2 in. (13.21 cm)
Depth: 10.5 in. (26.67 cm)
Weight: 11.1 lb. (5.04 kg)

Reliability: 25,000 hrs. MTBF (calculated)

POWER Requirements: 28 VDC
Consumption: 40 W, max
Cooling: Internal fan
Primary Power: 28 VDC, 78 W nomial (143 W max.)
Bezel Configuration: EFIS, MFD, custom
RECORDING Time: 2 hrs. of high-quality audio, 25 hrs. of flight data
Channels: 4 audio input channels; dual redundant 1553 data buses; 802.3 10/100 Ethernet with optional filtering; ARINC 429s; analogs; synchros and discretes
CONNECTORS Main: Connector MIL-C-38999
LRU: J1-55 and J2-100-pin connectors


  • Operating: -55 °C to +70 °C
  • Non-operating: -55 °C to +85 °C

Altitude: -1,000 ft. to 50,000 ft.
Vibration: MIL-STD-810F (operating)
Penetration: 500 lb./10 ft./¼-in. probe
Static Crush: 5,000 lb.
Fire Protection: 50,000 BTU/sq. ft./hr. for 60 min. at 1100 °C; 10 hrs. at 260 °C
Impact: 3,400 G, 6.5 ms, half-sine shock wave

UNDERWATER ACOUSTIC BEACON Beacon, six-year battery and bracket supplied with unit
REGULATORY SPECIFICATIONS Standard L3Harris Crash-Survivable Memory Unit tested to ED-55, ED-56a, TSOC123a, TSO -C124a
COMPANY CERTIFICATION ISO 9001:2008 and AS9100:2009 Rev. C Certified

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Visit Technical Support Website

To gain access to the latest technical publications, service bulletins and other pertinent information about your recorders or other L3Harris devices, operators and authorized repair facilities need to register with our technical support organization for the online library.

Technical support:
Phone & AOG hotline: +1 (321) 674-4900

Technical publications:

Cage Code / Federal Supply Code: 25583

Facility / Shipping / Mailing address:
5353 52nd Street, S.E.
Grand Rapids, MI 49512-9704 USA

Order administration / Sales / General inquiries:
Phone: +1 (616) 949-6600

Repair and overhaul administration: 
Phone: +1 (321) 674-4900
Fax: +1 (616) 977-6895
For service repair (Part 145) returned material authorizations (RMA): Visit RMA website

Data services: