Aerial work and private flights were permitted under the visual flight rules in dark night conditions, which are effectively the same as instrument meteorological conditions, but without sufficient requirements for proficiency checks and recent experience to enable flight solely by reference to the flight instruments.
The ATSB welcomes the introduction of a biennial flight review to maintain a night VFR rating (applicable to both fixed-wing and helicopter operations), and other changes to reduce the risk of this safety issue for helicopter operations. Nevertheless, the ATSB is still concerned that there is unnecessary residual risk for other fixed-wing aerial work and private flights conducted in dark night conditions under the NVFR. At this point in time, it is clear that CASA do not intend to take any further action to address this safety issue, so the ATSB is closing the safety issue as partially addressed.
The Australian Transport Safety Bureau recommends that the Civil Aviation Safety Authority prioritise its efforts to address the safety risk associated with aerial work and private flights as permitted under the visual flight rules in dark night conditions, which are effectively the same as instrument meteorological conditions, but without sufficient requirements for proficiency checks and recent experience to enable flight solely by reference to the flight instruments.
CASA partially accepts the recommendation in as much as regulation 61.970 of the Civil Aviation Safety Regulations 1998 (CASR) requires pilots to demonstrate competency during biennial night visual flight rules assessments. The regulation was made in February 2013 and commences in September 2014.
In addition, CASA also commenced a project on 16 December 2013, OS 14/01 Night Visual Flight Rules. This will consider whether to require a discernible external horizon during flights under Night Visual Flight Rules (NVFR). CASA proposes to clarify the definition of visibility in regulation 2 of the Civil Aviation Regulations 1988 (CAR) to ensure the primary coincident safety issue above is dealt with. CAR 2 defines visibility as the "ability, as determined by atmospheric conditions and expressed in units of distance, to see and identify prominent unlighted objects by day and prominent lighted objects by night". Project OS 14/01 CASA will consider whether to seek an amendment to this definition by adding to it the requirement that for NVFR, the determination of visibility must also include the ability to see a defined natural horizon. This will in effect address the root cause of the matters outlined in the safety issue as pilots will need to have a discernible horizon throughout their flight. If a discernable horizon is not present then the flight should be conducted under the Instrument Flight Rules (IFR) and all associated regulations for IFR flight will apply.
The project will also review the current NVFR regulatory requirements and CASR definitions to ensure it limits the visual environment to that in which a defined external horizon is available for aircraft attitude control. The project will examine the night VMC requirements for both rotorcraft and aeroplanes. However the outcome of the project may limit the change to the night VMC requirements to rotorcraft only in recognition of the difference in certification requirements between the categories. The project will also amend the guidance provided in CAAP 5.13-2 to emphasise the importance of maintaining a discernible external horizon at night particularly in light of the certification basis for NVFR rotorcraft.
The ATSB recognises CASA’s ongoing efforts to address this safety issue.
CASA partially accepted the recommendation and advised the ATSB in February 2014 that regulation 61.970 of the Civil Aviation Safety Regulations 1998 (CASR) requires pilots to demonstrate competency during biennial night visual flight rules assessments. The regulation was made in February 2013 and commenced in September 2014.
In addition, on 16 December 2013, CASA advised the ATSB that we had commenced project OS 14/01 Night Visual Flight Rules. This considered whether to require a discernible external horizon during flights under Night Visual Flight Rules (NVFR) and whether to amend the definition of visibility in regulation 2 of the Civil Aviation Regulations 1988 (CAR).
The project also reviewed the current NVFR regulatory requirements including CASR definitions and examined the NVMC requirements for both rotorcraft and aeroplanes. The project also proposed to amend the guidance provided in Civil Aviation Advisory Publication (CAAP) 5.13-2 to emphasise the importance of maintaining a discernible external horizon at night particularly in light of the certification basis for NVFR rotorcraft.
The outcomes of the project were limited to rotorcraft only in recognition of the difference in certification requirements between rotorcraft and aeroplanes.
As a result of this project I would like to advise that CASA has taken the following actions:
CASA considers this safety recommendation has been addressed and requests that this advice be published on the ATSB website.
On 24 October 2016, CASA advised the ATSB that it considers Safety recommendation AO- 2011-102-SR-059 had been fully addressed. While acknowledging the safety actions undertaken by CASA, the ATSB remains concerned about instrument proficiency, and visibility requirements for fixed-wing operations at night.
The ATSB welcomes the introduction of a biennial flight review for the night VFR rating, however does not consider that it fully supports the safety recommendation as there is no formal ongoing requirement to maintain instrument flying proficiency and currency.
CASA has addressed night visibility flight requirements for helicopter flights by amending AC 61-05 (section 6.5.5.1) and CAO 20.18 (section 3.2A (c)) however the ATSB is concerned the same standards do not apply to fixed-wing operational equipment. This relates directly to the safety issue raised as a result of another VFR flight into dark night accident investigated by the ATSB (AO-2011-100).
Based on CASA's actions to date, the ATSB intends to publish CASA's response on its website and retain the current status of safety recommendation AO-2011-102-SR-059 as 'Monitor'.
