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FDR/CVR Replay & Readout Explained
Flight Data Recorder (FDR) Replay & Cockpit Voice Recorders (CVR) Readout? What is it? Why do you need it.
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If you are searching for an affordable world class Flight Data Recorder (FDR) & Cockpit Voice Recorder (CVR) replay and readout solution that will maximize the information you receive to monitor the condition of your FDR system, we can help. Detailed analysis report can explore and understand the condition of your flight data recorder system with an unparalleled volume of information.
We’ll help you to meet specific aviation regulatory requirements and at the same time maximize your operational efficiency. Our flight data recorder replay service can deliver an instant readout of your flight data recorder. Saving you time and effort, increasing your ability to keep the fleet active.
FDR Replay & Readout FAQs
Flight Data Recorder replay and readout is the process of checking the health of your FDR system. This may also include important records from your Cockpit Voice Recorder (CVR)
Flight Data Services FDR replay and readout system uses knowledge specific to your aircraft configuration to provide results which are specific to your aircraft make and model. Our reports provide in depth analysis of each parameter recorded by your flight data recorder system, ensuring conformance with aviation regulations.
- Decreased lead times.
- Automatic analysis.
- In depth reporting.
The Air Navigation Order 2009 states that FDR replays should be conducted annually or every 12000 flight hours whichever comes first.
No; it is examined after a flight and for convenience many operators upload their data at regular intervals to fit in with maintenance schedules.
Should you decide to do your own flight data recorder readout in house:
- You need a means of transferring the data from the aircraft to the analysis software.
- You need analysis software to the order of £31,000 – £61,000 ($50,000 – $100,000) per copy.
- You need analyst expertise.
FDR Replay & Readout Explained
NY AERO offers automatic FDR analysis to help you to determine the health of your flight data recorder system. Our patented FDR replay and readout system analyses every parameter recorded by your flight data recorder to provide the information you need to understand the condition of your system. A host of tests are used to assess each FDR parameter including:
- Data spike detection
- Change detection analysis
- Calibration tests
- Parameter noise assessment
- Recording range tests
- Sampling frequency analysis
- Parameter correlation analysis
All tests are executed based on a set of analysis limits for each parameter which are unique to your specific aircraft and engine models.
The report is designed to maximize the amount of information available from the replay/readout of your FDR data, providing you with the tools to monitor the condition of your flight data recorder system. Each report contains:
- Detailed analysis of each parameter.
- Information regarding any errors detected during the analysis.
- Graphs and charts.
FDR Replay & Readout Regulations
The following extracts are from ICAO Annex 6 – Operation of aircraft:
6.10.10 Flight recorders — continued serviceability Operational
checks and evaluations of recordings from the flight data and
cockpit voice recorder systems shall be conducted to ensure the
continued serviceability of the recorders.
Attachment D - 3.2 : Annual inspections should be carried out as follows:
a) the read-out of the recorded data from the FDR and
CVR should ensure that the recorder operates correctly
for the nominal duration of the recording;
b) the analysis of the FDR should evaluate the quality of
the recorded data to determine if the bit error rate is
within acceptable limits and to determine the nature and
distribution of the errors;
c) a complete flight from the FDR should be examined in
engineering units to evaluate the validity of all recorded
parameters. Particular attention should be given to
parameters from sensors dedicated to the FDR. Parameters
taken from the aircraft’s electrical bus system need not
be checked if their serviceability can be detected by other
The following excerpt is taken from Advisory Circular 20-141:
8 a. Parameter Operational Check. The operator must perform an
operational and functional check to determine that each required
parameter is being recorded, that the recorded value is reasonable,
and that data quality is sufficient to interpret the data. This
operational and functional check is also referred to as a
reasonableness and quality check. Any parameter that is generated
by a sensor or transducer installed as part of the DFDRS or
exclusively used by the DFDRS must be functionally checked at the
time that the operational check is accomplished. See paragraph 7.l.(3).
The operator must retain the downloaded data (raw data in electronic
format that can be deciphered using the Data Stream Format contained
in the correlation document is acceptable) used in this check as a
permanent part of the aircraft records. The operator must note in its
maintenance program how to access the downloaded data used in this
check. See paragraph 7.l. (4) for a description of the operational and
The aforementioned document also outlines the necessary requirements for performing an FDR replay.
The following is an extract from CAP 731 – Approval, Operations Serviceability and Readout of Flight Data Recorder Systems and Cockpit Voice Recorders:
Articles 153, 154 and 155 of the Air Navigation Order 2009 require
that operators preserve a record of one representative flight made
within the last 12 months. The purpose of this is to ensure that,
in the event of an accident/incident, air accident investigators have
access to a readout from the flight data recording system that is
representative of the actual aircraft condition prior to the
accident/incident. It follows that the data originating from the
selected representative flight will need to be evaluated to determine
that it comprises a valid record.
The following is an extract from EASA Safety Information Bulletin 2009-28:
1. Accident Investigators have reported several cases in which the
Flight Data Recorders (FDR) or Cockpit Voice Recorders (CVR) have not
recorded data as expected, due to a malfunction of the unit or the
installation. Such failures may remain hidden for a certain amount of time,
as it is difficult / impossible to determine the full system functionality
onboard the aircraft. This behaviour is described as a dormant failure.
Recorder issues are further discussed in detail in the study performed by BEA.
2. The European Organization for Civil Aviation Equipment (EUROCAE) has
developed ED-112, the most recent industry standard for FDR and CVR. The adoption
of that document as European Technical Standard Order (ETSO) is in process (see
Notice of Proposed Amendment NPA 2009-11). In order to allow detection of
dormant failures the document recommends performing the following maintenance
· Every 3 000 flight hours or every 12 months, whichever
occurs first, download and analyse at least a whole flight
recording. Check that all mandatory parameters are
active and are of acceptable quality.
· Pre-Flight: check for no-failure.
The following extract is taken from Appendix II-B in ED-1112 Minimum Operational Performance Specification for Crash Protected Airborne Recorder Systems:
II-B.1.3 A copy of the recording including a whole flight (from recorder start
to recorder stop) should be made at specified intervals. The copy should be
transcribed such that all parameter samples can be resolved. All mandatory
parameters recorded should be expressed in engineering units. Inspection of
parameters should reveal defects or noise in the measuring and processing chains
and indicate necessary maintenance actions. When applicable, each mandatory
parameter should be checked for different values of its operational range. For
this purpose, some parameters should be inspected at different flight phases.
The operator shall retain the most recent copy recording.
ED-112 also specifies that the interval for performing the above task is set as 3000 flight hours or 12 months whichever comes first.
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