Expert guidance for aerospace systems, flight management, maintenance tracking, aviation safety, air traffic control systems, and aerospace software development.
Core Concepts
Aerospace Systems
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Flight Management Systems (FMS)
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Maintenance, Repair, and Overhaul (MRO)
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Air Traffic Control (ATC) systems
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Aircraft Health Monitoring
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Flight Operations Quality Assurance (FOQA)
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Crew resource management
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Ground handling systems
Aviation Technologies
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Avionics systems
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ACARS (Aircraft Communications Addressing and Reporting System)
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ADS-B (Automatic Dependent Surveillance-Broadcast)
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Flight data recorders (black boxes)
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Weather radar systems
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Autopilot and fly-by-wire
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Satellite communications
Standards and Regulations
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FAA regulations (Federal Aviation Administration)
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EASA standards (European Union Aviation Safety Agency)
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ICAO standards (International Civil Aviation Organization)
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DO-178C (software airworthiness)
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DO-254 (hardware airworthiness)
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SPEC-42 (maintenance tracking)
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ATA chapters (maintenance organization)
Flight Management System
from dataclasses import dataclass
from datetime import datetime, timedelta
from typing import List, Optional, Tuple
from decimal import Decimal
from enum import Enum
import numpy as np
class FlightPhase(Enum):
PRE_FLIGHT = "pre_flight"
TAXI = "taxi"
TAKEOFF = "takeoff"
CLIMB = "climb"
CRUISE = "cruise"
DESCENT = "descent"
APPROACH = "approach"
LANDING = "landing"
COMPLETED = "completed"
class FlightStatus(Enum):
SCHEDULED = "scheduled"
BOARDING = "boarding"
DEPARTED = "departed"
EN_ROUTE = "en_route"
DELAYED = "delayed"
ARRIVED = "arrived"
CANCELLED = "cancelled"
@dataclass
class Waypoint:
"""Navigation waypoint"""
name: str
latitude: float
longitude: float
altitude_ft: int
estimated_time: datetime
@dataclass
class Flight:
"""Flight information"""
flight_number: str
aircraft_id: str
aircraft_type: str
departure_airport: str
arrival_airport: str
scheduled_departure: datetime
scheduled_arrival: datetime
actual_departure: Optional[datetime]
actual_arrival: Optional[datetime]
status: FlightStatus
route: List[Waypoint]
crew_members: List[str]
passenger_count: int
cargo_weight_kg: float
@dataclass
class FlightPlan:
"""Filed flight plan"""
flight_plan_id: str
flight_number: str
aircraft_id: str
departure: str
destination: str
alternate_airports: List[str]
route_string: str
cruise_altitude_ft: int
cruise_speed_kts: int
estimated_flight_time: timedelta
fuel_required_kg: float
filed_at: datetime
class FlightManagementSystem:
"""Flight planning and management"""
def __init__(self):
self.flights = {}
self.flight_plans = {}
self.aircraft_positions = {}
def create_flight_plan(self, flight_data: dict) -> FlightPlan:
"""Create and file flight plan"""
flight_plan_id = self._generate_flight_plan_id()
# Calculate route
route = self._calculate_optimal_route(
flight_data['departure'],
flight_data['destination'],
flight_data['aircraft_type']
)
# Calculate fuel requirements
fuel_required = self._calculate_fuel_requirements(
route['distance_nm'],
flight_data['aircraft_type'],
flight_data.get('passenger_count', 0),
flight_data.get('cargo_weight_kg', 0)
)
flight_plan = FlightPlan(
flight_plan_id=flight_plan_id,
flight_number=flight_data['flight_number'],
aircraft_id=flight_data['aircraft_id'],
departure=flight_data['departure'],
destination=flight_data['destination'],
alternate_airports=flight_data.get('alternates', []),
route_string=route['route_string'],
cruise_altitude_ft=route['cruise_altitude'],
cruise_speed_kts=route['cruise_speed'],
estimated_flight_time=route['estimated_time'],
fuel_required_kg=fuel_required,
filed_at=datetime.now()
)
self.flight_plans[flight_plan_id] = flight_plan
# File with ATC
self._file_with_atc(flight_plan)
return flight_plan
def _calculate_optimal_route(self,
departure: str,
destination: str,
aircraft_type: str) -> dict:
"""Calculate optimal flight route"""
# Get airport coordinates
dep_coords = self._get_airport_coordinates(departure)
dest_coords = self._get_airport_coordinates(destination)
# Calculate great circle distance
distance_nm = self._calculate_distance(dep_coords, dest_coords)
# Determine cruise altitude based on distance and aircraft
if distance_nm < 500:
cruise_altitude = 25000 # FL250
elif distance_nm < 1500:
cruise_altitude = 35000 # FL350
else:
cruise_altitude = 39000 # FL390
# Determine cruise speed based on aircraft type
cruise_speeds = {
'B737': 450, # knots
'B777': 490,
'A320': 450,
'A350': 490
}
cruise_speed = cruise_speeds.get(aircraft_type, 450)
# Calculate flight time
flight_time_hours = distance_nm / cruise_speed
estimated_time = timedelta(hours=flight_time_hours)
# Generate route string (simplified)
route_string = f"{departure} DCT {destination}"
return {
'distance_nm': distance_nm,
'cruise_altitude': cruise_altitude,
'cruise_speed': cruise_speed,
'estimated_time': estimated_time,
'route_string': route_string
}
def _calculate_fuel_requirements(self,
distance_nm: float,
aircraft_type: str,
passengers: int,
cargo_kg: float) -> float:
"""Calculate required fuel for flight"""
# Fuel consumption rates (kg per nm)
fuel_rates = {
'B737': 3.5,
'B777': 8.0,
'A320': 3.2,
'A350': 7.5
}
base_rate = fuel_rates.get(aircraft_type, 4.0)
# Calculate trip fuel
trip_fuel = distance_nm * base_rate
# Add weight penalty (simplified)
weight_penalty = (passengers * 100 + cargo_kg) / 10000 * trip_fuel * 0.1
# Reserve fuel (45 minutes at cruise)
reserve_fuel = base_rate * 45 * 7.5 # 7.5 nm per minute
# Contingency fuel (5% of trip fuel)
contingency_fuel = trip_fuel * 0.05
# Alternate fuel (for diversion)
alternate_fuel = 100 * base_rate # 100 nm
total_fuel = trip_fuel + weight_penalty + reserve_fuel + contingency_fuel + alternate_fuel
return total_fuel
def track_flight_progress(self, flight_number: str) -> dict:
"""Track real-time flight progress"""
flight = self.flights.get(flight_number)
if not flight:
return {'error': 'Flight not found'}
# Get current position
current_position = self.aircraft_positions.get(flight.aircraft_id)
if not current_position:
return {
'flight_number': flight_number,
'status': flight.status.value,
'message': 'No position data available'
}
# Calculate progress
total_distance = self._calculate_distance(
self._get_airport_coordinates(flight.departure_airport),
self._get_airport_coordinates(flight.arrival_airport)
)
distance_from_origin = self._calculate_distance(
self._get_airport_coordinates(flight.departure_airport),
(current_position['latitude'], current_position['longitude'])
)
progress_percent = (distance_from_origin / total_distance) * 100
# Calculate ETA
if current_position.get('ground_speed', 0) > 0:
distance_remaining = total_distance - distance_from_origin
time_remaining_hours = distance_remaining / current_position['ground_speed']
eta = datetime.now() + timedelta(hours=time_remaining_hours)
else:
eta = flight.scheduled_arrival
return {
'flight_number': flight_number,
'status': flight.status.value,
'current_position': {
'latitude': current_position['latitude'],
'longitude': current_position['longitude'],
'altitude_ft': current_position['altitude_ft'],
'ground_speed_kts': current_position['ground_speed']
},
'progress_percent': progress_percent,
'distance_remaining_nm': total_distance - distance_from_origin,
'estimated_arrival': eta.isoformat(),
'on_time': eta <= flight.scheduled_arrival
}
def calculate_landing_performance(self,
aircraft_type: str,
runway_length_ft: int,
wind_speed_kts: int,
wind_direction: int,
runway_heading: int,
temperature_c: float,
altitude_ft: int) -> dict:
"""Calculate landing performance requirements"""
# Base landing distance for aircraft type
base_distances = {
'B737': 5000, # feet
'B777': 7000,
'A320': 4800,
'A350': 6500
}
base_distance = base_distances.get(aircraft_type, 5500)
# Wind component calculation
wind_angle = abs(wind_direction - runway_heading)
headwind = wind_speed_kts * np.cos(np.radians(wind_angle))
crosswind = wind_speed_kts * np.sin(np.radians(wind_angle))
# Adjust for headwind/tailwind
# Headwind: reduce distance by 10% per 10 knots
# Tailwind: increase distance by 20% per 10 knots
if headwind > 0: # Headwind
distance_adjustment = -0.1 * (headwind / 10)
else: # Tailwind
distance_adjustment = 0.2 * (abs(headwind) / 10)
# Adjust for temperature (density altitude)
isa_temp = 15 - (altitude_ft / 1000 * 2) # ISA standard
temp_deviation = temperature_c - isa_temp
temp_adjustment = temp_deviation * 0.01 # 1% per degree
# Calculate required landing distance
adjustments = 1 + distance_adjustment + temp_adjustment
required_distance = base_distance * adjustments
# Safety margin (typical 1.67 for dry runway)
safety_factor = 1.67
required_distance_with_margin = required_distance * safety_factor
# Check if runway is adequate
runway_adequate = runway_length_ft >= required_distance_with_margin
return {
'aircraft_type': aircraft_type,
'required_landing_distance_ft': int(required_distance_with_margin),
'available_runway_ft': runway_length_ft,
'runway_adequate': runway_adequate,
'margin_ft': runway_length_ft - required_distance_with_margin,
'conditions': {
'headwind_kts': headwind,
'crosswind_kts': crosswind,
'temperature_c': temperature_c,
'altitude_ft': altitude_ft
}
}
def _calculate_distance(self, point1: Tuple[float, float], point2: Tuple[float, float]) -> float:
"""Calculate great circle distance in nautical miles"""
from math import radians, sin, cos, sqrt, atan2
lat1, lon1 = radians(point1[0]), radians(point1[1])
lat2, lon2 = radians(point2[0]), radians(point2[1])
dlat = lat2 - lat1
dlon = lon2 - lon1
a = sin(dlat/2)**2 + cos(lat1) * cos(lat2) * sin(dlon/2)**2
c = 2 * atan2(sqrt(a), sqrt(1-a))
distance_km = 6371 * c # Earth radius in km
distance_nm = distance_km * 0.539957 # Convert to nautical miles
return distance_nm
def _get_airport_coordinates(self, icao_code: str) -> Tuple[float, float]:
"""Get airport coordinates"""
# Would query airport database
airports = {
'KJFK': (40.6413, -73.7781), # JFK
'KLAX': (33.9416, -118.4085), # LAX
'EGLL': (51.4700, -0.4543), # Heathrow
'LFPG': (49.0097, 2.5479) # Charles de Gaulle
}
return airports.get(icao_code, (0.0, 0.0))
def _file_with_atc(self, flight_plan: FlightPlan):
"""File flight plan with ATC"""
# Implementation would submit to ATC systems
pass
def _generate_flight_plan_id(self) -> str:
import uuid
return f"FPL-{uuid.uuid4().hex[:10].upper()}"
Aircraft Maintenance System
from enum import Enum
class MaintenanceType(Enum): A_CHECK = "a_check" # Every 400-600 flight hours B_CHECK = "b_check" # Every 6-8 months C_CHECK = "c_check" # Every 18-24 months D_CHECK = "d_check" # Every 6-10 years LINE_MAINTENANCE = "line_maintenance" UNSCHEDULED = "unscheduled"
@dataclass class Aircraft: """Aircraft information""" aircraft_id: str registration: str aircraft_type: str manufacturer: str model: str serial_number: str manufacture_date: datetime total_flight_hours: float total_cycles: int # Takeoff/landing cycles last_a_check: datetime last_c_check: datetime airworthiness_certificate: str next_major_inspection: datetime
@dataclass class MaintenanceRecord: """Maintenance work record""" record_id: str aircraft_id: str maintenance_type: MaintenanceType work_performed: str components_replaced: List[str] performed_by: str performed_at: datetime flight_hours_at_maintenance: float cycles_at_maintenance: int next_due_hours: Optional[float] next_due_date: Optional[datetime]
class AircraftMaintenanceSystem: """MRO (Maintenance, Repair, Overhaul) system"""
def __init__(self):
self.aircraft = {}
self.maintenance_records = []
self.component_tracking = {}
def check_maintenance_due(self, aircraft_id: str) -> dict:
"""Check if maintenance is due for aircraft"""
aircraft = self.aircraft.get(aircraft_id)
if not aircraft:
return {'error': 'Aircraft not found'}
due_items = []
# Check A-check (every 500 hours)
hours_since_a_check = aircraft.total_flight_hours - self._get_last_check_hours(
aircraft_id, MaintenanceType.A_CHECK
)
if hours_since_a_check >= 500:
due_items.append({
'type': 'A-check',
'urgency': 'high' if hours_since_a_check >= 550 else 'medium',
'hours_overdue': max(0, hours_since_a_check - 500)
})
# Check calendar-based C-check
days_since_c_check = (datetime.now() - aircraft.last_c_check).days
if days_since_c_check >= 540: # 18 months
due_items.append({
'type': 'C-check',
'urgency': 'critical' if days_since_c_check >= 600 else 'high',
'days_overdue': max(0, days_since_c_check - 540)
})
# Check component life limits
component_items = self._check_component_life_limits(aircraft_id)
due_items.extend(component_items)
return {
'aircraft_id': aircraft_id,
'registration': aircraft.registration,
'maintenance_required': len(due_items) > 0,
'due_items': due_items,
'airworthy': len([item for item in due_items if item['urgency'] == 'critical']) == 0
}
def _get_last_check_hours(self, aircraft_id: str, check_type: MaintenanceType) -> float:
"""Get flight hours at last check"""
records = [
r for r in self.maintenance_records
if r.aircraft_id == aircraft_id and r.maintenance_type == check_type
]
if records:
latest = max(records, key=lambda r: r.performed_at)
return latest.flight_hours_at_maintenance
return 0.0
def _check_component_life_limits(self, aircraft_id: str) -> List[dict]:
"""Check component life limits"""
due_items = []
components = self.component_tracking.get(aircraft_id, {})
for component_name, component_data in components.items():
if component_data['life_limit_hours']:
hours_used = component_data['hours_since_new']
life_limit = component_data['life_limit_hours']
if hours_used >= life_limit * 0.9: # Within 90% of life limit
due_items.append({
'type': 'component_replacement',
'component': component_name,
'urgency': 'critical' if hours_used >= life_limit else 'high',
'hours_remaining': max(0, life_limit - hours_used)
})
return due_items
def record_maintenance(self,
aircraft_id: str,
maintenance_data: dict) -> MaintenanceRecord:
"""Record completed maintenance"""
aircraft = self.aircraft.get(aircraft_id)
if not aircraft:
raise ValueError("Aircraft not found")
record = MaintenanceRecord(
record_id=self._generate_record_id(),
aircraft_id=aircraft_id,
maintenance_type=MaintenanceType(maintenance_data['type']),
work_performed=maintenance_data['work_performed'],
components_replaced=maintenance_data.get('components_replaced', []),
performed_by=maintenance_data['technician_id'],
performed_at=datetime.now(),
flight_hours_at_maintenance=aircraft.total_flight_hours,
cycles_at_maintenance=aircraft.total_cycles,
next_due_hours=maintenance_data.get('next_due_hours'),
next_due_date=maintenance_data.get('next_due_date')
)
self.maintenance_records.append(record)
# Update aircraft maintenance dates
if record.maintenance_type == MaintenanceType.A_CHECK:
aircraft.last_a_check = datetime.now()
elif record.maintenance_type == MaintenanceType.C_CHECK:
aircraft.last_c_check = datetime.now()
return record
def predict_maintenance_cost(self,
aircraft_type: str,
flight_hours_per_year: float) -> dict:
"""Predict annual maintenance costs"""
# Base maintenance costs per aircraft type
base_costs = {
'B737': {
'hourly_rate': 800, # $ per flight hour
'a_check': 25000,
'c_check': 500000,
'd_check': 5000000
},
'B777': {
'hourly_rate': 1500,
'a_check': 50000,
'c_check': 1000000,
'd_check': 10000000
}
}
costs = base_costs.get(aircraft_type, base_costs['B737'])
# Calculate annual costs
hourly_maintenance = flight_hours_per_year * costs['hourly_rate']
# A-checks (assume 2 per year for 1000 hours/year)
a_checks_per_year = flight_hours_per_year / 500
a_check_costs = a_checks_per_year * costs['a_check']
# C-check (amortized over 18 months)
c_check_annual = costs['c_check'] / 1.5
# D-check (amortized over 8 years)
d_check_annual = costs['d_check'] / 8
total_annual = hourly_maintenance + a_check_costs + c_check_annual + d_check_annual
return {
'aircraft_type': aircraft_type,
'flight_hours_per_year': flight_hours_per_year,
'maintenance_costs': {
'hourly_maintenance': hourly_maintenance,
'a_checks': a_check_costs,
'c_check_amortized': c_check_annual,
'd_check_amortized': d_check_annual,
'total_annual': total_annual
},
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