Global Aerodromes Classifications Coding Systems and Spatial Distribution Study Notes

ICAO VS IATA CODES: DEFINITIONS AND PURPOSE

• ICAO Location Indicators (Doc $7910$)

  • Definition: A $4$-letter alphanumeric code assigned by the International Civil Aviation Organization (ICAO) to uniquely identify every aerodrome, heliport, and Flight Information Region (FIR) worldwide.
  • Governing Document: ICAO Doc $7910$ – Location Indicators.
  • Legal Basis: Chicago Convention ($1944$), Annex $15$ – Aeronautical Information Services.
  • Structure: Region prefix ($1-2$ letters) + Aerodrome identifier ($2-3$ letters). Example: $RPLL = R$ (Asia) + $P$ (Philippines) + $LL$ (Manila).
  • Primary Purpose: Operational and regulatory uses including Air Traffic Control (ATC) communications, flight plan filing (ICAO Flight Plan Form), NOTAMs (Notices to Airmen), aeronautical charts, safety oversight, accident investigation, and meteorological reporting (METAR/TAF headers).
  • Key Facts: Mandatory for all certified aerodromes; assigned through national authorities; over $89$ active codes in the Philippines ($RP$ prefix); no duplicates permitted globally.

• IATA Location Identifiers

  • Definition: A $3$-letter code assigned by the International Air Transport Association (IATA) to airports with scheduled commercial airline service.
  • Governing Document: IATA Resolution $763$ – Location Identifiers.
  • Legal Basis: Voluntary industry standard; adopted through IATA membership agreements.
  • Structure: $3$ letters, often mnemonic to the city or airport name. Example: $MNL$ = Manila, $CEB$ = Cebu.
  • Primary Purpose: Commercial and passenger-facing uses including airline ticketing (PNR systems), baggage routing and handling (IATA Resolution $763$), Global Distribution Systems (GDS platforms like Amadeus, Sabre, and Travelport), Passenger Information Displays (FIDS), cargo waybills, and airport marketing.
  • Key Facts: Voluntary and selective (only for airports with commercial service); assigned upon airline request; approximately $30$ Philippine airports have IATA codes.

AIRLINE AND AIRCRAFT IDENTIFICATION SYSTEMS

• ICAO $3$-Letter Airline Designator

  • Definition: A unique $3$-letter code for aircraft operating agencies (airlines, air taxi, cargo operators).
  • Governing Document: ICAO Doc $8585$ – Designators for Aircraft Operating Agencies, Aeronautical Authorities and Services.
  • Usage: Used in operations, ATC flight plan callsigns, radar identification, NOTAMs, and accident investigations (ICAO Annex $13$).
  • Telephony Callsign: Associated radiotelephony callsign for ATC radio comms.
  • PAL: "Philippine"
  • CEB: "Cebu"
  • UAE: "Emirates"
  • BAW: "Speedbird" (British Airways)

• IATA $2$-Character Airline Designator

  • Definition: A $2$-character code (letters/digits) for commercial and distribution systems.
  • Governing Document: IATA Resolution $762$.
  • Usage: Airline tickets, boarding passes (e.g., $PR$ $502$), baggage tags, codeshare agreements, and cargo air waybills.
  • Numeric Accounting Prefix: Each carrier has a $3$-digit financial prefix:
  • PR (Philippine Airlines): $079$
  • 5J (Cebu Pacific): $203$
  • EK (Emirates): $176$
  • BA (British Airways): $125$

• Aircraft Type Codes

  • ICAO Type Code (Doc $8643$): A $4$-character alphanumeric designator used in flight plans (Item $9$), ATC systems, and wake turbulence categorization.
  • Examples: Boeing $737-800$ = $B738$; Airbus $A320-200$ = $A320$.
  • IATA Type Code (SSIM Appendix C): A $3$-character equipment code used in airline scheduling and GDS systems.
  • Examples: Boeing $777-300ER$ = $77W$; ATR $72-600$ = $ATR$.

PHILIPPINE AIRCRAFT REGISTRATION AND NATIONALITY MARKS

• Nationality Mark: Assigned by ICAO (Annex $7$). For the Philippines, the mark is $RP$.
• Registration System: Maintained by CAAP. Structure consists of the nationality mark followed by a suffix.
  • RP-Cxxxx: Used for Commercial category aircraft (e.g., $RP-C3439$ for an Airbus $A330$).
  • RP- (no C): Used for Private or General Aviation aircraft.
• Legal Basis: Chicago Convention Article $20$ (Nationality marks), ICAO Annex $7$, Republic Act No. $9497$ (CAAP Act of $2008$), and PCAR Part $3$.

ICAO CODE HIERARCHICAL STRUCTURE

• First Letter (ICAO Region):
  • R: Eastern Asia (Philippines, Japan, Korea, Taiwan)
  • K: Contiguous United States
  • E: Northern Europe (UK, Scandinavia, Baltics)
  • W: South and Southeast Asia (Indonesia, Malaysia)
  • Z: China
  • V: South Asia and Mainland SE Asia (India, Thailand, Vietnam)
  • L: Southern Europe (France, Italy, Spain, Greece)
  • D: West Africa
  • H: East/Southern Africa
  • S: South America
  • C: Canada
• Second Letter (Country/Territory):
  • RP: Philippines | RJ: Japan | RK: South Korea | RC: Taiwan
  • EG: United Kingdom | ED: Germany | EH: Netherlands
  • WI: Indonesia | WM: Malaysia | WS: Singapore
• Last $2$ Letters: Specific Aerodrome Identifier (assigned sequentially or mnemonically by national authority).

PHILIPPINE AERODROMES AND ICAO CODE ASSIGNMENT

• Assignment Process:
  1. CAAP identifies the need for a new or revised indicator.
  2. Request is submitted to the ICAO Asia-Pacific Regional Office (Bangkok).
  3. ICAO validates uniqueness against the Doc $7910$ global database.
  4. Approved codes are published via the AIRAC cycle (every $28$ days).
  5. Effective dates are coordinated with aerodrome operational readiness.
• Philippine Context: There are $89$ active indicators. Decommissioned aerodromes retain codes for $5$ years per ICAO policy. Code changes require coordination with the Aeronautical Information Service Center (AISC).

AERODROME CLASSIFICATION AND OPERATIONAL TIERS

• Operational Tiers:
  • International Hub Aerodromes: High-volume traffic, greater operational complexity, stringent oversight, and higher resource allocation for safety.
  • Domestic-Only Aerodromes: Serve local/regional flights, smaller scale, adapted security resources.
• Classification Criteria:
  • Passenger & Cargo Volume: Determines traffic intensity.
  • International Services: Distinguishes hubs from domestic sites.
  • Regulatory Certification: Confirms compliance with ICAO standards.
  • Infrastructure Capacity: Runway length, terminal facilities, and navigation aids.

SPATIAL DISTRIBUTION AND FLIGHT INFORMATION REGIONS (FIRs)

• Definition: FIRs are airspace divisions where ATC, alerting, and flight information services are provided.
• Manila FIR (RPHI):
  • ICAO Designator: $RPHI$.
  • Limits: Lateral: approx. $05^{\circ}N$ to $21^{\circ}N$, $116^{\circ}E$ to $130^{\circ}E$. Vertical: Surface to unlimited ($FL$ unlimited).
  • Adjacent FIRs: Taipei ($RCAA$), Hong Kong ($VHHK$), Ho Chi Minh ($VVHM$), Kota Kinabalu ($WBFC$), Jakarta ($WIIF$), and Oakland Oceanic ($KZAK$).
• Key ATS Routes:
  • A1: Manila to Hong Kong (Northbound).
  • B591: Manila to Taipei (via BOREG and ELATO).
  • L625: Domestic backbone (Luzon to Mindanao).

ICAO ANNEX 14: AERODROME REFERENCE CODE AND DESIGN STANDARDS

• Aerodrome Reference Code (ARC):
  • Element 1 (Reference Field Length):
  • 1: $< 800\,m$
  • 2: $800\,m$ to $< 1,200\,m$
  • 3: $1,200\,m$ to $< 1,800\,m$
  • 4: $\geq 1,800\,m$
  • Element 2 (Wingspan / Outer Main Gear Wheel Span):
  • A: Wingspan $< 15\,m$ | Wheel Span $< 4.5\,m$
  • B: Wingspan $15\,m$ to $< 24\,m$ | Wheel Span $4.5\,m$ to $< 6\,m$
  • C: Wingspan $24\,m$ to $< 36\,m$ | Wheel Span $6\,m$ to $< 9\,m$
  • D: Wingspan $36\,m$ to $< 52\,m$ | Wheel Span $9\,m$ to $< 14\,m$
  • E: Wingspan $52\,m$ to $< 65\,m$ | Wheel Span $9\,m$ to $< 14\,m$
  • F: Wingspan $65\,m$ to $< 80\,m$ | Wheel Span $14\,m$ to $< 16\,m$
  • Philippine Examples: $RPLL$ ($4E$), $RPVM$ ($4E$), $RPVP$ ($4D$).

RUNWAY DESIGNATORS AND DECLARED DISTANCES

• Designation Rules: Based on magnetic bearing divided by $10$ (rounded to nearest $10^{\circ}$). Range: $01$ to $36$.
  • Parallel: Suffix $L$ (Left), $C$ (Center), $R$ (Right).
  • Reciprocal: Designator $\pm 18$ (e.g., $RWY$ $06$ and $RWY$ $24$).
• Declared Distances:
  • TORA (Take-Off Run Available): Length of runway available for ground run.
  • TODA (Take-Off Distance Available): $TORA$ + clearway.
  • ASDA (Accelerate-Stop Distance Available): $TORA$ + stopway.
  • LDA (Landing Distance Available): Length available for landing; reduced by displaced threshold.

AERODROME PHYSICAL CHARACTERISTICS AND SAFETY AREAS

• Runway Strip: Area enclosing runway. Width for Code $3/4$ instrument runways: $150\,m$ each side. Purpose: protect aircraft running off the runway.
• RESA (Runway End Safety Area): Min length $90\,m$ (recommended $240\,m$). Width: at least twice runway width. Purpose: reduce damage from undershoots/overruns.
• Taxiway Design: Width based on Code Letter ($A=7.5\,m$ to $F=25\,m$). Rapid Exit Taxiways ($RETs$) use a $30^{\circ}$ angle.
• Apron/Stand Clearance: Wingtip-to-object clearance by Code: Code $C$ ($4.5\,m$), Code $E$ ($7.5\,m$), Code $F$ ($7.5\,m$).

REGULATORY FRAMEWORK: CAAP AND PCAR

• PCAR Part 9 (Aerodrome Certification): Requirements for licensing, physical characteristics, visual aids, Rescue and Firefighting (ARFF), and Emergency Planning (AEP).
• PCAR Part 12 (Safety Management System): Mandates SMS implementation, risk management, and mandatory safety reporting.
• Oversight Structure: Includes Director General, Deputy DG for Operations, Flight Standards Inspectorate Service (FSIS), and Aerodrome Standards Division (ASD).

PHILIPPINE AERODROME DATABASE: COMPLETE REFERENCE

• Luzon/NCR:
  • RPLL (MNL): Ninoy Aquino Intl; NCR; ARC $4E$; International Hub; $2$ runways.
  • RPVM (CRK): Clark International; Central Luzon; ARC $4E$; International Hub; $A380$-capable.
  • RPLB (SFS): Subic Bay Intl; Central Luzon; ARC $4D$; Former US Naval base.
  • RPLC (BAG): Loakan Airport; Baguio; ARC $2B$; Domestic.
• Visayas:
  • RPVP (CEB): Mactan-Cebu Intl; Cebu; ARC $4D$; International Hub.
  • RPVK (KLO): Kalibo International; Aklan; ARC $3C$; Boracay gateway.
  • RPVO (TAG): Tagbilaran/Panglao Intl; ARC $4C$; New Panglao airport.
• Mindanao:
  • RPMD (DVO): Francisco Bangoy Intl; Davao; ARC $4C$; Mindanao gateway.
  • RPMR (CGY): Laguindingan; Misamis Oriental; ARC $4C$; Domestic.
  • RPMP (GES): General Santos Intl; South Cotabato; ARC $3C$; Domestic/International.

QUESTIONS & DISCUSSION

• Mnemonic Activity:
  • RP = "Republic of the Philippines"
  • K = "Kingdom of the Skies" (USA)
  • EG = "England's Great airports"
  • RJ = "Rising Japan"
• Spatial Flow Chart Steps: Identify target aerodromes, record coordinates from AIP/Doc $7910$, plot on grid, overlay FIR boundaries, connect airways, and label regulatory data.
• Team Divisions: Luzon Team (Manila FIR), Visayas Team (Inter-island routes), Mindanao Team (Border FIRs).