Which statement about interphone placement is accurate?

Which statement about interphone placement is accurate?

• A. There are no interphones in OFCR
• B. There are three interphones in OFCR and one in OFAR
• C. There are four interphones in OFCR and none in OFAR
• D. Interphones are only in the flight deck

Answer: (B)

Interphone placement is about ensuring crew can reach each other quickly across flight deck and cabin/rest areas. On the 787, the distribution shown—three interphones in the main crew rest area (OFCR) and one in the other rest area (OFAR)—provides sufficient access points for crew inside the rest areas to contact the flight deck and other zones without needing to go to a single fixed location. This setup keeps communication direct and reliable where crew members are most likely to need it, while avoiding overconcentration in one spot. Having no interphones in OFCR would isolate that area from the call system, making it harder to reach the flight deck or other stations. Conversely, placing four interphones in OFCR and none in OFAR would overstaff one area while depriving the other of direct access. Limiting interphones to the flight deck would ignore the need for cabin/rest area crew to initiate or receive calls directly.

Interphone placement is about ensuring crew can reach each other quickly across flight deck and cabin/rest areas. On the 787, the distribution shown—three interphones in the main crew rest area (OFCR) and one in the other rest area (OFAR)—provides sufficient access points for crew inside the rest areas to contact the flight deck and other zones without needing to go to a single fixed location. This setup keeps communication direct and reliable where crew members are most likely to need it, while avoiding overconcentration in one spot.

Having no interphones in OFCR would isolate that area from the call system, making it harder to reach the flight deck or other stations. Conversely, placing four interphones in OFCR and none in OFAR would overstaff one area while depriving the other of direct access. Limiting interphones to the flight deck would ignore the need for cabin/rest area crew to initiate or receive calls directly.