Chapter 6 Instrument Approach Procedures Flashcards
What is the most important factor surrounding the design of an aerodrome?
Terrain
What is the Vat for category A, B, C, D and E aircraft?
A = less than 91 B = 91-120 C = 121-140 D = 141-165 E = 165+
What are the categories of aircraft based upon?
Based on Vat (1.23Vs1g or 1.3Vso)
What is the radius of MSA?
25nm from the nav aid sevicing the approach
What is the guaranteed obstacle clearance when flying at MSA?
300m
When can you fly below MSA?
- aerodrome is visible
- aircraft is being radar vectored
- aircraft is flying a published procedure
What is a NDBL?
NDB locator (low powered NDB)
Which type of approach has a DH?
Precision approach
Which type of approach has MDA?
Non-precision approach
Does a precision approach require distance measuring?
Doesn’t have to but can do
What is the expected accuracy of the pilot on a precision approach?
Pilots expected to within half of a scale deflection of the CDI
What is the minimum DH for each category of ILS?
1 = 200ft 2 = 100ft 3A = none 3B = none 3C = none
What must be done if the glideslope is lost?
- it becomes a non precision approach
- carry out a missed approach or if you have time descend to LOC only minimum
If a missed approach is executed before MDA what must be done and why?
Must pass over missed approach point because missed approach procedure starts at the missed approach procedure
Who sets the MDA/DH and what does it depend on?
Operator and depends on category of a/c (can be more restrictive than OCH/OCA but not less)
What is the OCH/OCA and who sets it?
The minimum level for MDA/DH and is set by the state
Is a visual approach part of an instrument approach?
Yes (it’s finishing an instrument approach visually)
Who provides separation on a visual approach?
ATC
How many segments are on an instrument approach?
5
What are the 5 segments of an instrument approach?
1 = arrival 2 = initial approach 3 = intermediate approach 4 = final approach 5 = missed approach
Define a straight-in approach
- non precision = where FAT is less than 30 degrees of runway heading
When are you established on an NDB?
Within 5 degrees of FAT
What is the guaranteed obstacle clearance in the primary area?
300m (600m in high terrain areas)
What is the guaranteed obstacle clearance in the secondary area?
Reduces to zero towards the outer edges of the secondary area
What is the fix tolerance area?
The zone of uncertainty area of where you are due to the inaccuracies of two fixes
What is the most accurate fix for track guidance and bearings?
ILS
What is the most accurate fix for overhead position?
NDB (smallest cone of confusion)
Where does the arrival segment begin and end?
Begins = at 25nm Ends = at IAF
Where does the initial segment begin and end?
Begins = at IAF Ends = at IF (initial approach fix)
Where does the intermediate segment begin and end?
Begin = IF Ends = FAF
Where does the final segment begin and end?
Begins = FAF Ends = MAPt
What is the MOC in the arrival segment?
300m
What is the MOC in the initial segment?
300m
What is the MOC in the intermediate segment?
300-150m
What is the MOC in the final segment?
DH for precision
MDH for non precision
When ATC ask you to carry out an approach what other info could they ask for?
To report over significant point or nav aid or beginning a procedure or base turn
Where does a STAR usually begin and end?
Starts at the end of the route and ends at the IAF
What is the max intercept between IF and IAF for each type of approach?
Non precision = 120 degrees
Precision = 90 degrees
What is the max intercept angle and track length for a DR segment?
Angle = 45 degrees
Track length = 10nm
What is the max and optimum distance of the FAF from the threshold?
Optimum = 5nm Max = 10nm
If there is no FAF when can you begin to let down to MDA/H?
Once established on the FAT
Define an FAP?
A point where an aircraft intercepts the glidepath - only found on ILSs without DME
Who is responsible for terrain clearance?
PIC except when under IFR radar vectors
What the optimum final approach gradient?
Not to exceed 5.2%
What is the max permissible gradient where a steeper gradient is necessary and can this be exceeded?
6.5% (this can be greater if approved by the state)
What are the three types of track reversal?
- 45/180 degree procedure turn (normal type)
- 80/260 degree procedure turn
- base turn
What is the leg of the 45 degree turn on a 45/180 procedure?
Cat A and B = 1 minute
Cat C, D and E = 1 minute 15 seconds
Which track reversal type gives a reciprocal reversal of track?
A procedure turn
What takes priority over timing when making a procedural turn?
A turning point (TP)
In what missed approach segment are now turns allowed to be designed?
Initial phase
What is the minimum missed approach climb gradient and what obstacle clearance does this guarantee?
2.5% and 30m clearance
When does the initial phase and intermediate phase of the missed approach begin and end respectively?
When climb is established
What is the minimum obstacle clearance in the final phase of a missed approach?
50m
Define a MAPt?
The point of intersection of an electronic glidepath (needs finishing)
What is the aim of MAPt?
To ensure the minimum obstacle clearance isn’t infringed throughout the procedure
What is area navigation (RNAV) based on?
VOR/DMEs which are co located and waypoints
Define a waypoint
A specified geographical location used to define an area nav route or flight path
What is the distance between RNAV and RNAV RNP?
RNAV RNP can detect errors in entry of waypoints
What is the most important factor with regards to instrument approaches?
Speed