Flight Inspection practical.pptx

FLIGHT INSPECTION OF CNS FACILITIES
Practical

Topics to be Covered/Objectives
Pre Flight Inspection procedure
In-Flight Inspection/adjustment procedure LLZ
In-Flight Inspection/adjustment procedure GP
Post Flight Inspection Procedure LLZ/GP
ILS THALES PLI COURSE RTC-NR
6/6/2023 2

At the end of this session, trainee will be able to:
Take the Backup of Preflight/post flight Backup of System
Must be able to understand the phraseology of flight
inspector before doing adjustment
Competent to do the Transmitter adjustment as
instructed by flight inspector
Competent to do the Monitor adjustment as per station
requirement
6/6/2023 3

Pre-Flight Inspection procedure
Readiness of Ground equipment to be calibrated
Co-ordination with Local ATC for withdrawal of ILS Facility
Initiation of NOTAM action for equipment under calibration
Availability of Competent Maintenance personnel to make
corrections and adjustments
Software and Hardware Backup of System Ground check
etc.
Ensure DGPS points intact and availability of last Flight
Inspection Report etc.
6/6/2023 4

In-Flight Inspection procedure
Adjustment procedure for LLZ/GP
Understanding adjustment windows of system
Understanding message of flight inspector
Calculation and applying the adjustments
Conveying message to flight inspector
Recording of all adjustments done
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Localizer Flight Checks:
1. Coverage :
2. CRS/CLR Width:
3. LLZ Course Line :
4. LLZ structure:
5. High Angle:
6. Monitor Alarms:
In-Flight Inspection/adjustment procedure LLZ

 Put the LLZ on maintenance mode with key switch on
LCP.
 Login to level 4 or 5 in ADRACS.
 Note down the pre-calibration data and save system
LDA data through ADRACS
 Go to adjustment window shown by maintenance sign
at bottom tool bar.
 Open the Normal waveform data for on Arial
transmitter.
 Select/adjust RF/DDM/SDM as per requirement.
 Enter the desired data as per requirement of FIU.
Adjustment procedure
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Access To Enter Maintenance window

Normal waveform and Monitor Windows

Flight Inspection Procedure of LLZ
1. Coverage Check and Power Alarm:
Availability of ILS signal within its service volume
operating on mains & Battery backup.
Adjustment : Course CSB RF Level
Clearance CSB RF Level
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Power Alarm Window
13 W Nominal Power
13 W Nominal Power

CRS and CLR Width Check LLZ:
Purpose:
• Adjust & Ensure Course Width within tolerance;
• Check signal in the sector +10° and + 35° of C/L
Flight Procedure:
• Cal aircraft flies an arc about Runway center line at approx. 5 NM from LLZ &
1500’ AGL.
Values and tolerances :
• COURSE WIDTH (W) = W ± 17% for CAT I, II & W ± 10% for CAT III
Adjustment : SBO Amplitude ( SBO Power) - Course
• Signal in the course sector increase linearly to 175 μ Amps (18% DDM) till
10° on either side of C/L.
• Minimum Signal in the clearance sector between ±10° to ± 35° sector should be
150 μ Amps (15.5% DDM).
Adjustment : SBO Amplitude ( SBO Power) - Clearance
6/6/2023 16
Flight Inspection Procedure of LLZ

Adjustment : SBO Amplitude ( SBO Power) – CRS/CLR
Apply formula as below:
Example : Commissioning Course Width =3.10
Measured Course width = 3.62
Normal CRS SBO value = 53.6
New SBO = 53.6 x 3.62
3.10
New SBO to be entered = 62.7%
6/6/2023 17
New SBO=Measured SBO x Measured CW
Required CW

Transmitter Nominal course width and Monitor data
Nominal CW in Monitor

New Course width after adjusted SBO power
CW after Adjustment in Monitor

Course Line Adjustment
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Nominal Course CSB DDM Value - 0
Go to Normal waveform Data of on Arial
Transmitter.
Adjust Course CSB DDM as per Requirement.
Increase 150 Hz for dominant of C/L on RHS.
Increase 90 Hz for dominant of C/L on LHS.

Course Line Adjustment Procedure
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Shifting of C/L towards 90 Hz dominance
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Shifting of C/L towards 150 Hz Dominance
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Monitor Alarms Check:
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Course Line: Alarms for change in Course Line
toward left or right of the Centre Line:
Cat I : + 10.5 m or 1.5 % DDM;
Cat II : + 7.5 m or 1.09 % DDM;
Cat III : + 6 m or 0.88 % DDM
Curse width:
Cat I : + 17 % of Nominal Value
Cat II: + 17 % of Nominal Value
Cat III: + 17 % of Nominal Value

Monitor Alarms Procedure C/L:
6/6/2023 25
To check dominance of C/L towards
RHS and LHS.
Change CRS CSB DDM as per tested
facility –CAT-I,CAT-II,CAT-III.
Check corresponding change in
Monitor
If any further change is required
follow the instructions of onboard
Flight Inspector.

Course Position Alarm 150 Hz Dominance
-8.13 micro Amp Nominal DDM

Course Position 90 Hz Dominance
-8.13 micro Amp Nominal DDM

Monitor Alarms Check CRS Width:
6/6/2023 28
Curse width:
 Cat I : + 17 % of Nominal Value
 Cat II: + 17 % of Nominal Value
 Cat III: + 17 % of Nominal Value
New SBO= Nominal CW X Nominal SBO
Required CW(17 % of Nominal)

6/6/2023 30
Glide Path Checks:
1. Glide Angle:
2. Sector Width:
3. GP structure:
4. GP coverage:
5. Monitor Alarms:
In-Flight Inspection/adjustment procedure GP

6/6/2023 31
Purpose: To check actual the Glide angle of GP
Flight Procedure:
The calibration aircraft approaches inbound on extended center line
at 1500′ AGL from 10 NM to Threshold.
Glide angle
Commissioning : No tolerances allowed
Routine :
± 7.5% of θ for CAT I & II (2.775 to 3.225 Deg for θ=3)
± 4% of θ for CAT III ( 2.88 to 3.12 Deg, for θ=3 )

6/6/2023 32
Open Normal Waveform data of on Arial Transmitter.
Adjust CRS CSB1 DDM as per requirement.
Change the DDM setting to µA from percent.
To increase glide angle increase +150 Hz
For decreasing glide angle increase -90 Hz.
Check the corresponding change in Monitor the same
change should appear as you adjusted for transmitter.
Note down the final adjusted values for future
reference.

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6/6/2023 34
Open Normal Waveform data of on Arial Transmitter.
Adjust CRS Width from width adjustment tool.
Apply the formula:
Check the corresponding change in Monitor, the same
change should appear as you adjusted for transmitter.
Note down the final adjusted values for future
reference.
Scale factor=100 x Measured CW
Required CW

6/6/2023 35

6/6/2023 36
• Under
wider than
above
• Above
wider than
under
• Under
wider than
above
• Above
wider than
under
Glide
Angle
Too High
Glide
Angle
Too High
Glide
Angle
Too Low
Glide
Angle
Too Low
Increase
CSB1
DDM
Decrease
SBO
Amplitude
Increase
SBO
Amplitude
Decrease
CSB1
DDM

6/6/2023 37
Increase
CSB1
Amplitude
Decrease
CSB2
Amplitude
Above wider than under
Correct Glide Angle Unsymmetrical Width
Under wider than above

6/6/2023 38
Increase
SBO
Amplitude
Decrease
SBO
Amplitude
Glide Angle Too High
In correct Glide Angle symmetrical Width
Glide Angle Too Low
Changing SBO with 1 % changes the glide angle with 0.01 deg.

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1. Save Transmitter Data and record in
Log Book
2. Take Reference of M1/M2/M3/NF
Data with PIR
3. Monitor and SOAC adjustment if
required
4. Ground Check of LLZ
5. Initiation of Cancelation of NOTAM
6/6/2023 ILS THALES PLI COURSE RTC-NR 46

6/6/2023 47

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