Solid state memory for aircraft flight data recorder systems

Details Solid state memory for aircraft flight data recorder systems Solid state memory for aircraft flight data recorder systems

1984-02-06

1987-02-17

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 300, G06F 1300

Patent

active

046444947

ABSTRACT:
A memory unit for a aircraft flight data recorder system uses an electronically erasable solid state memory for storing the flight data and a memory controller circuit are housed in a penetration resistant, thermally insulated enclosure. Power dissipation within the insulated enclosure is minimized by an external switching circuit that applies operating potential to the solid state memory only when data are being transferred to and from the memory circuit. A data protection circuit, located within the insulated enclosure inhibits memory write and erase operations whenever the system operating potential falls below a predetermined level. In continuously storing flight data, the oldest stored data is overwritten with newly arriving flight data and the memory controller maintains an erased boundary that defines the beginning and end of the recorded data. A power monitor circuit, located outside the insulated enclosure, resets the memory controller to the erased boundary following a power interruption. A dedicated portion of the memory space is utilized to store the address of faulty memory locations (detected during the data storage sequence) and stores the beginning and ending memory address of selected portions of the data record. The memory controller is sequenced to skip both the faulty memory locations and memory storage locations associated with the selected portions of the data record when new flight data is being stored.

REFERENCES:
patent: 3753244 (1973-08-01), Sumilas
patent: 4307455 (1981-12-01), Juhasz et al.
patent: 4355376 (1982-10-01), Gould
patent: 4408306 (1983-10-01), Kuo
patent: 4409670 (1983-10-01), Herndon et al.
patent: 4421977 (1983-12-01), Kittredge
patent: 4471441 (1984-09-01), Check Jr.
Proceedings of the 11th Symposium, "Aircraft Integrated Data Systems", Sep. 22-24, 1981, at DFVLR in Koln--Porz.
"Solid--State Flight Incident Recorder", by D. Amundson, Sperry Univac, St. Paul, USA presented at above--referenced symposium.
"Solid State Crash Survivable Flight Data Recorders for Mishap Investigation", by H. R. Ask, Hamilton Standard, Windsor Locks, USA, above--referenced symposium.

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