Limitations¶
Starter Limitations¶
- Maximum 3 starts within 1 min 30 s combined starter running time
- Followed by 4 min OFF
ITT Limits During Start¶
- 800°C – 840°C: up to 20 seconds
- 840°C – 950°C: up to 5 seconds
Performance Class¶
- ATR 42/72 is in Performance Class A
Aeroplane Category (Speed Classification)¶
Aeroplanes are classified by VAT (indicated airspeed at threshold = VSO × 1.3 or VS1G × 1.23 in landing configuration at maximum certificated landing mass; use the higher value if both are available):
| Category | VAT |
|---|---|
| A | Less than 91 kt |
| B | 91 to 120 kt |
| C | 121 to 140 kt |
- The specific category for each Company aeroplane type is stated in Part B for each type
- For circling approaches: CAT B approaches are prohibited — use CAT C minima and speeds
- CAT C maximum circling speed: 180 kt within 4.20 nm of the runway
Acceptable Deferred Defects (B / C Classification)¶
B Defects¶
- Defects where further damage or deterioration could affect airworthiness, but deferment is acceptable for a maximum specified period, provided:
- The defect is permitted by the appropriate MEL
- The defect is unlikely to deteriorate to an unairworthy condition within 30 days, or the date/hours/cycles if specified in the MEL 'limitations' section
- The cumulative effect of multiple B defects on the same aircraft must continue to satisfy the above conditions
C Defects¶
- Do not affect airworthiness
- Should be rectified at the earliest opportunity