Under ETSO-C2176a, what is the required duration for the deep sea pressure test when it is performed on a separate unit from the sea water immersion test?

The deep sea pressure test may be performed on two different units provided that both units undergo the rest of the sequence and that the period of the deep sea pressure test is 90 days.

What is the maximum depth and pressure for the deep sea immersion test of a crash-protected airborne recorder under ETSO-C2176a?

The recorder must be immersed in seawater at a pressure of 60 MPa, equivalent to a depth of 6 000 m (20 000 feet).

Under ETSO-C2176a, when can the deep sea pressure test period be reduced to 24 hours?

The 90-day period may be reduced to 24 hours provided that the test is performed once after the sea water immersion test in paragraph 2-4.2.7 b.

What is the required duration and temperature for the sea water immersion test at 3 m depth under ETSO-C2176a?

The recorder must be immersed in seawater at a depth of 3 m and a temperature of at least +25.0 °C for a period of 90 days.

Under ETSO-C2176a, what exception allows a recorder to be exempt from the deep sea pressure immersion test?

The recorder is exempt if it can be shown that the recording medium can withstand deep-sea immersion and is unlikely to be damaged by collapse of protective armour, or except if the recorder is deployed during or following impact with water.

What is the condition for reducing the sea water immersion test at 3 m depth from 90 days to 24 hours under ETSO-C2176a?

The 90-day period may be reduced to 24 hours provided that the methods and materials used to protect the recording medium have been shown to be unaffected by sea water.

Under ETSO-C2176a, what is the requirement for the identification marking when the sea water immersion test is performed?

The sea water immersion test is required unless it can be shown that the recording medium and the identification required by paragraph 2-1.16.3 are resistant to the corrosive effects of seawater.

What is the allowed method to avoid damage to test equipment during the deep sea pressure test under ETSO-C2176a?

The test may be performed using any suitable liquid in the pressure chamber itself, together with a means to separate this liquid from the seawater in which the recorder is immersed.

Appendix 1 to ETSO-C2176a - MPS for Crash-Protected Airborne Recorder Systems

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Appendix 1 to ETSO-C2176a – MPS for Crash-Protected Airborne Recorder Systems

ED Decision 2020/011/R

The standard EUROCAE ED-112A, MOPS for Crash Protected Airborne Recorder Systems, dated September 2013, shall be modified as per Table 1 below.

Table 1 — Modification of EUROCAE ED-112A

Location	Initial ED-112A text	Amending text
2-1.16.2 a. iii.	Impact shock, shear and tensile test, penetration resistance, static crush, deep sea pressure and sea water immersion.	Impact shock, shear and tensile test, penetration resistance, static crush, deep sea pressure and sea water immersion. Deep sea pressure and sea water immersion may be performed on two different units provided that both units undergo the rest of the sequence and that the period of the deep sea pressure test is 90 days.
2-4.2.7 a.	Unless it can be shown that the recording medium can withstand the conditions associated with deep sea immersion and that it is unlikely to be damaged as a consequence of collapse of any protective armour, immerse the recorder in sea water at a pressure of 60 MPa (equivalent to a depth of 6 000 m (20 000 feet) for a period of 30 days. This period may be reduced to 24 hours provided that the methods and materials used to protect the recording medium have been shown to be unaffected by sea water. To avoid damage to the test equipment, this test may be performed using any suitable liquid in the pressure chamber itself together with a means to separate this liquid from the sea water in which the recorder is immersed.	Unless it can be shown that the recording medium can withstand the conditions associated with deep-sea immersion and that it is unlikely to be damaged as a consequence of collapse of any protective armour or except if the recorder is deployed during or following impact with water, immerse the recorder in seawater at a pressure of 60 MPa (equivalent to a depth of 6 000 m, i.e. 20 000 feet) for a period of 90 days. This period may be reduced to 24 hours provided that the test is performed once after the sea water immersion test in 2-4.2.7 b. To avoid damage to the test equipment, this test may be performed using any suitable liquid in the pressure chamber itself, together with a means to separate this liquid from the seawater in which the recorder is immersed.
2-4.2.7 b.	Unless it can be shown that the recording medium and the identification required by paragraph 2-1.16.3 are resistant to the corrosive effects of sea water, immerse the recorder in sea water at a depth of 3 m and nominal temperature of +25°C for a period of 30 days.	Unless it can be shown that the recording medium and the identification required by paragraph 2-1.16.3 are resistant to the corrosive effects of seawater, immerse the recorder in seawater at a depth of 3 m and a temperature of at least + 25.0 °C for a period of 90 days.

[Amdt ETSO/16]

Details

Source-Title: Appendix 1 to ETSO-C2176a - MPS for Crash-Protected Airborne Recorder Systems View latest amendments

Erulesid: ERULES-1963177438-18188 Compare versions

Domain: Initial airworthiness

Amendedby: Amendment 16

Applicabilitydate: 25 July, 2020

Entryintoforcedate: 25 July, 2020

Regulatorysource: ED Decision 2020/011/R Navigate

Regulatorysubject: CS-ETSO

Typeofcontent: CS (Certification specification)

Parentir: ETSO-2C176a

Origin: EASA

Category: EAR