VOLUME 4 AIRCRAFT EQUIPMENT AND OPERATIONAL AUTHORIZATIONS
Chapter 14 GENERAL OPERATING AND FLIGHT RULES—MAINTENANCE ISSUES
Section 9 Safety Assurance System: Monitor Cockpit Voice Recorders
23.1457, Cockpit Voice Recorders.
25.1457, Cockpit Voice Recorders.
27.1457, Cockpit Voice Recorders.
29.1457, Cockpit Voice Recorders.
91.609, Flight Data Recorders and Cockpit Voice Recorders.
121.227, Pressure Cross-Feed Arrangements.
121.359, Cockpit Voice Recorders.
125.227, Cockpit Voice Recorders.
129.24, Cockpit Voice Recorders.
135.151, Cockpit Voice Recorders.
• Title 49 United States Code
(49 U.S.C.) § 1114, Disclosure, Availability, and Use of Information.
4-1551 REPORTING SYSTEM.
A. Program Tracking and Reporting Subsystem (PTRS) Activity Codes. For Title
14 of the Code of Federal Regulations (14 CFR) parts
• Ramp Inspection: 3627.
• Spot Inspection: 3628.
• Cockpit En Route Inspection: 3629.
• Ramp Inspection: 5627.
• Spot Inspection: 5628.
• Cockpit En Route Inspection: 5629.
B. Safety Assurance System (SAS). For 14 CFR parts
SAS automation. This section is related to SAS Element 4.6.1 (AW) Avionics Special Emphasis Programs.
4-1552 OBJECTIVE. This section provides guidance in monitoring cockpit
voice recorders (CVR) during spot, ramp, and cockpit en route inspections.
4-1553 GENERAL. Title 14 CFR requires that certain aircraft be equipped
with a CVR that meets approved design and installation criteria. The regulations
also stipulate that the data obtained from the CVR cannot be used in any civil penalty or certificate action.
NOTE: This does not negate the aviation safety inspector’s (ASI) authority
and responsibility to monitor the CVR during the performance of airworthiness surveillance functions.
A. Requirements of CVR Maintenance Procedures. The Avionics ASI
is responsible for determining that the maintenance procedures ensure that tests
are conducted according to procedures provided by the CVR manufacturer and shall
include, at a minimum, listening to the recorded signals on each channel to verify
that the audio is being recorded properly, is intelligible, and is free from electrical noise or other interference. Any review
of recorded audio should be from a timeframe where the aircraft is in operation, or as a minimum, with powerplants operating.
NOTE: Pay particular attention to tape-based CVRs. These devices are
at the end of their service life and may not be supported with accurate service documents and parts.
Tape-based systems are subject to calendar and hourly life limits not associated with CVRs equipped with non‑mechanical recoding media.
B. Monitoring the CVR. There are no restrictions in the regulations
that prevent periodic monitoring of the CVR as a method of surveillance.
1) ASIs are cautioned against monitoring CVR data for any purpose other than determining the quality of the recording.
2) Monitoring should be done only to the extent necessary to
determine that the quality of reproduction and maintenance of the CVR is adequate.
C. Acoustic Underwater Locating Device (ULD) Maintenance.
1) To ensure the timely activation of ULDs associated with CVRs,
Avionics ASIs should evaluate their certificate holder’s maintenance and inspection
programs to ensure that procedures for testing ULDs are conducted concurrently with battery replacement in accordance with manufacturer’s recommendations.
2) Operators’ maintenance or inspection programs should also
be evaluated to ensure that operational testing is being accomplished, consistent
with the CVR or ULD manufacturer’s recommended procedures, at specified intervals
and, when possible, in conjunction with a numbered or phase inspection (e.g., “A,” “B,” or “C” check).
3) These requirements must be reflected on work cards or other inspection cards to ensure system‑wide compliance.
4-1554 PREREQUISITES AND COORDINATION REQUIREMENTS.
A. Prerequisites. Experience with the equipment being inspected.
B. Coordination. This task requires coordination with the operator.
4-1555 REFERENCES, FORMS, AND JOB AIDS.
A. References (current editions).
• Advisory Circular (AC)
and Operational Approval of Cockpit Voice Recorder Systems;
• Volume 6, Chapter 2, Section 4, Safety
Assurance System: Ramp Inspections for Part
135 Air Carriers;
• Volume 6, Chapter 2, Section 6, Safety
Assurance System: Conduct Spot Inspection of a Program Manager/Operator’s Aircraft; and
• Volume 6, Chapter 2, Section 9, Safety
Assurance System: Cockpit En Route Inspections.
B. Forms. FAA Form 8430-13, Request for Access to Aircraft.
C. Job Aids. None.
B. Monitor the CVR.
1) If this task is being done as part of an en route inspection,
obtain permission from the pilot in command (PIC) before plugging into the CVR system.
NOTE: Be aware that not all phone jacks on CVR cockpit monitors are wired for operation.
2) If this task is being done as part of a spot or ramp inspection, accomplish the following:
a) Coordinate with the maintenance supervisor before conducting the inspection.
b) Monitor the in-progress maintenance to ensure that the CVR is being evaluated
for performance of its intended function. Check all channels to ensure that
the audio is being recorded properly, is intelligible, and is free from electrical noise or other interference.
3) Monitor the cockpit area microphone to ensure that it satisfactorily picks up all cockpit audio.
NOTE: Be aware that the quality of reproduction of some CVRs can be
affected by ground operation of auxiliary power units (APU) and ground power units (GPU).
4) Review the certificate holder’s maintenance procedures for
acoustic ULDs to ensure that the manufacturer’s recommendations are closely followed, including the procedures for the battery check.
4-1557 TASK OUTCOMES.
A. Complete the PTRS Record. For part
B. Follow SAS Guidance Modules 4 and 5. For parts
D. Document the Task. File all supporting paperwork in the applicant’s office file.
4-1558 FUTURE ACTIVITIES. Follow SAS guidance.
RESERVED. Paragraphs 4-1559 through 4-1575.