Radio communication failure

통신 두절은 그 자체로는 비상이 아닙니다 — 계획이 사라질 때 비상이 되죠. 오늘은 "안 들릴 때 무엇을 순서대로 시도하고, 어떻게 한 방향으로라도 대화를 복구하는지"를 말하는 연습입니다. 문법은 시도의 연쇄를 말하는 try + -ing.

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1. Scenario

I was the First Officer of HL123, just after departure, when the handoff to departure control went quiet.

I called departure twice — no response. We tried switching back to the previous frequency, and we tried calling on box two as well, but nobody came back to us. Then we noticed something useful: we could still hear other aircraft and the controller clearly. The receiver was fine — it was our transmitter that had failed.

We squawked 7600 and kept transmitting blind, in case anyone could hear us. Within a minute the controller adapted: "HL123, if you read, squawk ident." We identified, and just like that we had one-way communication — he would ask, and we would answer with ident.

Using that loop, he asked whether we wanted to return; we identified yes. He vectored us back with simple, one-at-a-time instructions, confirmed each turn by watching our ident, and had the tower back everything up with a steady green light on final. We landed normally, and maintenance later confirmed a transmitter fault.

2. At a Glance

English — After departure, nobody answered our calls. We tried the previous frequency, then box two — still nothing — and then realized we could hear everyone: only the transmitter had failed. We squawked 7600 and kept transmitting blind. The controller adapted quickly, building a one-way channel — "if you read, squawk ident" — and used it to ask our intentions, vector us back, and clear us to land with a steady green light from the tower as backup. Losing the radio is not an emergency by itself; losing the plan is — and both sides had a plan.

한국어 — 이륙 직후 관제 호출에 아무 응답이 없었습니다. 이전 주파수, 2번 무전기까지 시도해도 조용했는데 — 다른 항공기와 관제사의 말은 다 들렸어요. 수신은 정상, 송신기만 고장이었던 겁니다. 7600을 스쿽하고 혹시 몰라 블라인드 송신을 계속했습니다. 관제사는 곧바로 "들리면 ident를 누르라"는 일방향 채널을 만들었고, 그걸로 복귀 의사를 확인하고, 벡터를 주고, 파이널에선 타워의 스테디 그린 라이트로 착륙 허가를 백업했습니다. 무전 상실 자체는 비상이 아닙니다 — 계획 상실이 비상입니다.

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3. Key Verbs

respond

뜻: 응답하다

• Departure did not respond to our calls.
• Nobody responded on either frequency.

reach

뜻: (교신이) 닿다, 연결되다

• We could not reach departure control.
• The controller could not reach us either — one side was dead.

switch

뜻: 전환하다

• We switched back to the previous frequency.
• We switched to box two and tried again.

squawk

뜻: (트랜스폰더 코드를) 맞추다

• We squawked 7600 for radio failure.
• "If you read, squawk ident."

ident

뜻: 트랜스폰더 식별 신호를 보내다

• We idented to show we could hear him.
• Each instruction was confirmed when we idented.

vector

뜻: 벡터를 주다, 침로로 유도하다

• The controller vectored us back to the field.
• We were vectored with simple, one-at-a-time headings.

signal

뜻: 신호를 보내다

• The tower signaled us with a steady green light.
• A green light signals that you are cleared to land.

adapt

뜻: (방식을) 바꿔 적응하다

• The controller adapted to one-way communication.
• We adapted our answers to ident-for-yes.

troubleshoot

뜻: 고장 원인을 좁혀가다

• We started troubleshooting from the simplest check.
• Troubleshooting told us the receiver still worked.

restore

뜻: 복구하다

• Communication was restored only after landing.
• The fault could not be restored in flight.

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4. Key Expressions & Collocations

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5. Vocabulary

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6. Sentence Frames

빈칸만 갈아끼우면 다른 장비 고장 시나리오에도 그대로 씁니다.

• We tried ____ing, but ____. → We tried switching back to the previous frequency, but nobody answered.
• We could still ____, so the problem was ____. → We could still hear everyone, so the problem was our transmitter.
• We squawked ____ and kept ____ing. → We squawked 7600 and kept transmitting blind.
• He asked ____, and we answered with ____. → He asked whether we wanted to return, and we answered with ident.
• Everything was backed up by ____. → Everything was backed up by a steady green light from the tower.

오늘의 표현 포인트 — "We tried ____ing, but ____." 시도 → 실패 → 다음 시도. 트러블슈팅을 순서대로 말하게 해 주는 틀로, 모든 장비 고장 서술에 재사용됩니다.

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7. Common Mistakes → Better Phrasing

한국인이 자주 쓰는 틀리거나 약한 표현을, 시험에서 통하는 표현으로 바꿔 익히세요.

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8. Grammar Point — try + -ing (여러 방법을 시도했다)

고장 대처는 결국 "이것도 해 보고, 저것도 해 봤다"의 연속입니다. try + -ing로 이으세요.

• We tried calling on box two.
• We tried switching back to the previous frequency.
• We even tried resetting the audio panel — still nothing.

핵심: try + -ing = 방법을 시험 삼아 해 보다. (try to + 동사원형은 "애써 노력하다"라 뉘앙스가 다릅니다.) tried A, tried B, then realized C — 이 리듬이면 진단 과정이 깔끔하게 전달돼요.

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9. Model Answer — Q1

"What happened to your aircraft? Explain the nature of the incident."

틀은 자유 — 무슨 일 → 어떻게 대처 → 결과 흐름이면 됩니다.

Just after departure, the handoff to departure control went quiet. I called twice — nothing. We tried switching back to the previous frequency, and we tried calling on box two, but nobody came back to us.

Then we noticed we could still hear other aircraft and the controller clearly. That told us the receiver was fine and our transmitter had failed. We squawked 7600 and kept transmitting blind, in case anyone could still hear us.

The controller adapted very quickly. He called, "HL123, if you read, squawk ident" — we identified, and from then on we had one-way communication: he asked, we answered with ident. He asked whether we wanted to return, we identified yes, and he vectored us back with simple, one-at-a-time instructions, watching our ident after each turn. On final, the tower backed everything up with a steady green light.

We landed normally, and maintenance confirmed a transmitter fault. Losing the radio was never the emergency — we had a plan, the controller had a plan, and the two matched.

10. Model Answer — Q2

"How do you think ATC handled the situation? Could it have been handled differently?"

Q2 = ATC 평가로 의견 표현을 익히는 자리. 아래는 한 예시 — 외워서 그대로 쓰지 말고, 시작·마무리 표현은 자유롭게 바꿔 보세요.

Given that they could not hear a single word from us, I think the controller did a genuinely clever job. Instead of just calling again and again, he built a working channel out of what was left — "if you read, squawk ident" — and then used it properly: short questions, one instruction at a time, a pause to watch our ident after each turn. Adding the tower's steady green light on final meant we never had to wonder whether the landing clearance was real.

If I had to point at a gap, it took several unanswered calls before he moved to the ident method — going to it one round earlier would have shortened the uncertain phase, and that is the phase where crews start to doubt themselves. Small point, though; the recovery itself was textbook, and it felt like he was ahead of us the whole way down.

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11. Follow-up Q&A

1. Why squawk 7600 instead of declaring anything by voice? → We could not transmit — 7600 is how you declare it. The code tells every radar controller our radios are gone.
2. Why keep transmitting blind if the transmitter has failed? → Because in the air you can never be sure which side is dead. Blind transmissions cost nothing and might still be heard.
3. What does a steady green light from the tower mean? → Cleared to land. Light signals are the standard backup when radios are out.
4. What would you have done if you could not hear ATC either? → Squawk 7600, fly the last clearance and the published lost-comm procedure, and land — the system is designed so both sides can predict each other.

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12. Shadowing Sentences

각 문장을 3~5번 소리 내어 따라 하세요.

1. The handoff to departure control went quiet.
2. We tried switching back to the previous frequency.
3. We tried calling on box two as well.
4. We could still hear everyone — our transmitter had failed.
5. We squawked 7600 and kept transmitting blind.
6. If you read, squawk ident.
7. He asked whether we wanted to return, and we identified yes.
8. He vectored us back with one-at-a-time instructions.
9. The tower backed us up with a steady green light.
10. Losing the radio is not an emergency — losing the plan is.

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