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при необходимости stresses
gen.	where applicable (Dianka); as appropriate (Юрий Гомон); if helpful (Alik-angel); if need be (TarasZ); in appropriate cases (grafleonov); if situation so requires (Alexey Lebedev); as warranted (ulkomaalainen); as the need required (Andrey Truhachev); if considered necessary (Johnny Bravo); if deemed necessary (Johnny Bravo); if such a need arises (Johnny Bravo); where needed (Alex_Odeychuk); if it is necessary; as may be required from time to time (D Cassidy); when necessary (dimock); when such a need arises (Johnny Bravo); where appropriate (Stas-Soleil); desirably (Svetozar); when relevant (spanishru)
avia.	when applicable (ЛисаА)
bank.	case of need (Yeldar Azanbayev)
busin.	on an as-needed basis (Candidates may be expected to work overtime, including weekends, and to travel on an as-needed basis. dumb rabies)
fire.	with the need for (чего-либо: действия/объекта OLGA P.)
formal	should the need arise (dafni)
idiom.	in a pinch (VLZ_58)
law	as necessary (Alexander Matytsin); as needed (Alexander Matytsin); if required (Alexander Matytsin); where required (Alexander Matytsin); if appropriate (Leonid Dzhepko)
math.	as the need arose; when needed; as may be required
med.	as the circumstances require (Andrey Truhachev); pro re nata (Andrey Truhachev); as the circumstance arises (Andrey Truhachev); in the circumstances (Andrey Truhachev); SOS (inn)
media.	optionally
meteorol.	observation (краткое общее указание о предполагаемых изменениях по окончании периода прогноза)
O&G, casp.	when requested (Yeldar Azanbayev)
O&G, sakh.	as needs dictate; if needed; as required; as the need arises
offic.	if any (Alexander Matytsin); if proved necessary (Alexander Matytsin); as may be necessary (Alexander Matytsin); on as-needed basis (Alexander Matytsin)
patents.	optionally (В настоящее время (~ c 2010 г.) рекомендуются только варианты "необязательно" и "при необходимости", являвшийся ранее допустимым "возможно" исключен HeneS)
polym.	optional (bonly)
progr.	if relevant (ssn)
R&D.	if applicable (igisheva); when appropriate (igisheva)
road.wrk.	where it is necessary to (Yeldar Azanbayev)
scient.	when required (igisheva)
telecom.	if desired (oleg.vigodsky); if necessary (oleg.vigodsky)
transp.	where necessary (Yeldar Azanbayev)

при необходимости : 108 phrases in 38 subjects

Architecture	2
Aviation	4
Banking	1
Business	2
Computer networks	2
Computers	2
Cycling other than sport	1
Economics	1
Electronics	1
Energy industry	1
Furniture	1
General	18
Idiomatic	2
Information technology	3
Insurance	1
Internet	1
Law	7
Librarianship	1
Makarov	2
Mass media	7
Mechanics	2
Medical	13
Military	2
Notarial practice	2
Occupational health & safety	2
Officialese	2
Oil / petroleum	2
Pharmacy and pharmacology	1
Politics	1
Production	2
Programming	8
Public relations	1
Radio	1
Radiology	2
Sakhalin R	1
Technology	2
Telecommunications	3
Weapons and gunsmithing	1