(1)  
a total vertical error (TVE) of ±90 m (±300 ft);

(2)  
an altimetry system error (ASE) of ±75 m (±245 ft); and

(3)  
an assigned altitude deviation (AAD) of ±90 m (±300 ft).

(b)  
Reports of such occurrences shall be sent to the competent authority within 72 hours. Reports shall include an initial analysis of causal factors and measures taken to prevent repeat occurrences.

(c)  
When height-keeping errors are recorded or received, the operator shall take immediate action to rectify the conditions that caused the errors and provide follow-up reports, if requested by the competent authority.

Subpart E — Low visibility operations (LVO)

SPA.LVO.100 Low visibility operations
The operator shall only conduct the following low visibility operations (LVO) when approved by the competent authority: 
(a)  
low visibility take-off (LVTO) operation;

(b)  
lower than Standard Category I (LTS CAT I) operation; 

(c)  
Standard Category II (CAT II) operation; 

(d)  
other than Standard Category II (OTS CAT II) operation; 

(e)  
Standard Category III (CAT III) operation; and

(f)  
approach operation utilising enhanced vision systems (EVS) for which an operational credit on the runway visual range (RVR) minima is applied. 

SPA.LVO.105 LVO approval
To obtain an LVO approval from the competent authority, the operator shall demonstrate compliance with the requirements of this Subpart. 

SPA.LVO.110 General operating requirements
(a)  
The operator shall only conduct LTS CAT I operations if: 

(1)  
each aircraft concerned is certified for operations to conduct CAT II operations; and

(2)  
the approach is flown:

(i)  
auto-coupled to an auto-land that needs to be approved for CAT IIIA operations; or

(ii)  
using an approved head-up display landing system (HUDLS) to at least 150 ft above the threshold.

(b)  
The operator shall only conduct CAT II, OTS CAT II or CAT III operations if:

(1)  
each aircraft concerned is certified for operations with a decision height (DH) below 200 ft, or no DH, and equipped in accordance with the applicable airworthiness requirements;

(2)  
a system for recording approach and/or automatic landing success and failure is established and maintained to monitor the overall safety of the operation;

(3)  
the DH is determined by means of a radio altimeter; and

(4)  
the flight crew consists of at least two pilots.

(c)  
The operator shall only conduct approach operations utilising an EVS if:
　
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本文鏈接地址：Annexes to the draft Commission Regulation on ‘Air Operations - OPS’(153)