26,157 service difficulty reports for the Boeing 777 (all variants) across 39 systems (1995–2026).
Reported systems
| System | ATA | Reports | Share |
|---|---|---|---|
| Lights | ATA 33 | 13,963 | 53.4% |
| Equipment & Furnishings | ATA 25 | 1,642 | 6.3% |
| Doors | ATA 52 | 1,503 | 5.7% |
| Fuselage | ATA 53 | 1,181 | 4.5% |
| Air Conditioning | ATA 21 | 1,008 | 3.9% |
| Electrical Power | ATA 24 | 821 | 3.1% |
| Wings | ATA 57 | 634 | 2.4% |
| Engine - Turbine/Turboprop | ATA 72 | 484 | 1.9% |
| Fire Protection | ATA 26 | 451 | 1.7% |
| Communications | ATA 23 | 425 | 1.6% |
| Fuel | ATA 28 | 376 | 1.4% |
| Auxiliary Power Unit (APU) | ATA 49 | 323 | 1.2% |
| Flight Controls | ATA 27 | 316 | 1.2% |
| Landing Gear | ATA 32 | 291 | 1.1% |
| Hydraulic Power | ATA 29 | 277 | 1.1% |
| Pneumatic | ATA 36 | 243 | 0.9% |
| Nacelles & Pylons | ATA 54 | 233 | 0.9% |
| Engine Fuel & Control | ATA 73 | 229 | 0.9% |
| Windows | ATA 56 | 223 | 0.9% |
| Navigation | ATA 34 | 208 | 0.8% |
| Ice & Rain Protection | ATA 30 | 187 | 0.7% |
| Indicating & Recording | ATA 31 | 154 | 0.6% |
| Oxygen | ATA 35 | 133 | 0.5% |
| Water & Waste | ATA 38 | 133 | 0.5% |
| Engine Air | ATA 75 | 122 | 0.5% |
| Stabilizers | ATA 55 | 113 | 0.4% |
| Engine Exhaust | ATA 78 | 94 | 0.4% |
| Standard Practices - Structures | ATA 51 | 64 | 0.2% |
| Ignition | ATA 74 | 63 | 0.2% |
| Engine Oil | ATA 79 | 62 | 0.2% |
| Starting | ATA 80 | 57 | 0.2% |
| Engine Indicating | ATA 77 | 55 | 0.2% |
| Auto Flight | ATA 22 | 44 | 0.2% |
| Power Plant | ATA 71 | 29 | 0.1% |
| Engine Controls | ATA 76 | 7 | 0% |
| Other | ATA 14 | 3 | 0% |
| Placards & Markings | ATA 11 | 3 | 0% |
| Other | ATA 83 | 2 | 0% |
| Other | ATA 37 | 1 | 0% |
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).