IEEE - Aerospace and Electronic Systems - May 2021 - 45

Marques et al.

Figure 8.
Test Procedures 5 and 6.

After the complete software loading (Step 2), the tester
reboots the aircraft (Step 3). The tester checks that the
LAS units have different software versions (Step 4a).
For the TP6, The ACCS identifies a mismatch of the SI
and the CRC among units (Step 4b). The ADS informs
the existence of different software versions (Step 5). In

the end, all the LAS units do not have the same software
versions (Final State).
Test Procedures 1-6 cover all the 23 Requirements
identified in the F-LAS framework. Table 1 contains the
traceability between Requirements and Test Procedures.
The verification of some Requirements in multiple Test
Procedure is notable.

Table 1.

Traceability
Procedures
Test
Procedures

between

Requirements

and

Test

SAFETY AND SECURITY
Scenario

Requirements

TP1

Normal software
loading with
manual check

BLR-1 to BLR5, MCR-6 to
MCR-9

TP2

Normal software
loading with
automatic check

BLR-1 to BLR5, ACR-10, 11,
14, 15, 18, 19

TP3

Incomplete
software loading
with manual
check

MCR-7 to
MCR-9

Incomplete
software loading
with automatic
check

ACR-12, 13,
16, 17

Different
software
versions with
manual check

VER-22

Different
software
versions with
automatic check

VER-20, 21, 23

TP4

TP5

TP6

MAY 2021

ANALYSIS

Avoiding the identified threats identified, we defined associated assurances. These threats may provide critical
impacts on the operation of the aircraft, affecting the
safety of the occupants and crew. We can identify the correlation of threats and associated assurances, as presented
in Table 2.
Threats 1 and 2 identified in Table 2 appear as adverse
effects on security due to human action (intentional or
unintentional) using access, use, disclosure, denial,

Table 2.

Threats and associated assurance
Threat

Description

Associated
Assurance

1

Improper
configuration

Use of MCP or ACCS.

2

Incomplete
loading

Use of CRC.

3

Malfunction
with version
conflict

Check that the LAS
units have same
software versions.

IEEE A&E SYSTEMS MAGAZINE

45



IEEE - Aerospace and Electronic Systems - May 2021

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